Grand Blue Dreaming – Season 2: Seven Years Later and It Only Got Better
Seven years. That is how long Grand Blue fans had to wait. Seven whole years between Season 1 ending in September 2018 and Season 2 finally arriving in July 2025. And honestly? After a wait that long, this season could have been a disaster. The hype alone could have crushed it. But no — Grand Blue Dreaming Season 2 came back swinging, absolutely delivered, and reminded everyone exactly why this show has one of the most devoted fanbases in modern anime comedy.
If you watched Season 1 and wondered whether the magic could still be captured after so long, the answer is yes. Completely and unreservedly yes. And if you are new here wondering what all the fuss is about — first of all, go watch Season 1 immediately. Then come back. This article will be here.
For everyone else, let us get into it. Everything about Grand Blue Dreaming Season 2 — the story, the characters, the new additions, the themes, and where it all goes from here.
Introduction – The Return Nobody Knew They Needed This Much
Grand Blue Dreaming Season 2 was officially announced in September 2024, setting off a wave of celebration across anime communities worldwide. The second season aired from July 8 to September 23, 2025, broadcasting on Tokyo MX and other networks in Japan. International viewers could catch it on Crunchyroll, which streamed it weekly every Monday.
The production brought back almost everything from the original. Director and scriptwriter Shinji Takamatsu returned, as did character designer Hideoki Kusama. The animation was handled by Zero-G once again, but this time joined by Liber as a co-production studio — and the result is visibly sharper animation quality across the board, particularly in the comedy scenes and especially underwater.
The opening theme this season is "Seishun Towa" (青春永遠 — "Eternal Youth"), performed by Shōnan no Kaze featuring Atarashii Gakko! — an absolute banger that perfectly captures the chaotic youthful energy of the show. The ending theme is "Hadaka de Dotsukiai" (裸でどつきあい — "Let's Punch Each Other While Naked") by SEAMO featuring May'n, which is perhaps the most perfectly titled ending song in anime history and you cannot convince me otherwise.
Before the season even finished airing, it was confirmed as the highest-scoring sequel anime of Summer 2025 on MyAnimeList — beating out major competition. And when the final episode broadcast in Japan on September 23, 2025, a Season 3 was immediately announced during the credits. Season 3 is set to premiere in July 2026, this time taking place in a fictional version of Palau. The train is not stopping.
Story – Every Episode, Every Detail, Nothing Skipped
Season 2 picks up roughly three months after where Season 1 left off. Iori has settled into his life at Grand Blue, the Peek-a-Boo club feels like home, and you would think things might calm down. They do not. Not even slightly. If anything, Season 2 cranks everything up a notch — the comedy is bigger, the misunderstandings are messier, and a new character arrives who completely reshapes the dynamic.
Episode 1 – "Sister" (妹)
Three months have passed since Season 1. Iori and the others are comfortably embedded in their chaotic Grand Blue routine. Then something unexpected arrives: a handwritten letter from Iori's younger sister Shiori, along with a handmade doll. Nanaka reads the letter aloud at the shop, and what follows is an immediate chain of misunderstandings — because when has anything involving Iori ever not escalated into chaos?
The letter's contents cause Nanaka to misinterpret something about Iori's relationship with Chisa, which naturally means Iori spends most of the episode desperately trying to explain himself. But the real bombshell comes at the very end: Shiori herself shows up. She overheard a conversation suggesting that Iori might be set to marry Chisa, and her reaction tells us immediately that this little sister is not going to be a passive character. She is furious, she is scheming, and she has arrived to cause problems.
The episode also opens with a beautiful Iori and Chisa dive together — a callback to the underwater magic of Season 1 — reminding you that yes, this is still technically a diving anime, and the ocean still looks absolutely stunning.
Episode 2 – "Brother" (兄)
Shiori reveals her mission immediately. She wants Iori to come back home and run the family inn. To achieve this, she has decided — with absolutely twisted logic — to pretend to be obsessively in love with her own brother to drive him away from Grand Blue. She shows up with what can only be described as Y2K spy movie gadgets to stalk and monitor Iori's movements.
Here is the thing about Shiori: she is clearly extremely intelligent and resourceful. Which makes her chosen plan even more baffling and hilarious, because there are approximately a thousand more practical ways she could achieve her goal. But she is not doing the practical thing. She is doing the most extreme, overcomplicated, absolutely ridiculous thing possible — and it fits the Grand Blue universe perfectly.
In a moment of accidental mercy, Shiori actually helps Iori escape one of Nanaka's rage attacks, which leads to a genuine sibling moment between them. Iori is confused, Shiori is maintaining her cover story, and the episode ends with the dynamic between them firmly established: he thinks she is weird, she is playing a long game, and the audience already loves her.
Episode 3 – "Image Game" (印象ゲーム)
This episode drops what might be the single most important piece of information in the entire season: Toshio (Iori's uncle) accidentally lets it slip that Iori and Chisa are not actually related by blood. They are not biological cousins. The Kitahara and Kotegawa families have a close connection through friendship rather than blood relation.
The impact of this revelation ripples out immediately. Aina, who has feelings for Iori, hears this and processes the information with visible emotional complexity. The whole dynamic of the Iori-Chisa relationship, which has always existed in a comfortable ambiguity shielded partly by the "we are cousins" framing, now has a very different weight to it. Nothing is acted on immediately — this is Grand Blue, not a romance drama — but the air shifts noticeably.
The episode also features an "impression game" among the club members that produces some of the funniest character moments of the season. Watching characters describe their true perceptions of each other while trying to phrase things diplomatically (and failing) is comedy gold.
Episode 4 – "Ticket Scramble" (チケット争奪戦)
Aina tries to organize a proper girls' night in Chisa's room. This being Grand Blue, the event keeps getting invaded and derailed in increasingly creative ways. The boys are trying desperately to get their hands on a ticket to the Ōmi Women's University Festival — the event Aina has a spare ticket for — and the competition over that single ticket causes total social chaos.
This episode is a rare one in that the boys do not get drunk. Instead, the girls' party takes center stage, with Nanaka and others ending up hilariously intoxicated. The resulting drunk behavior from the female cast members, particularly Nanaka, is comedic gold. There is also a moment involving Aina and Chisa discussing their insecurities that, while played for laughs, is genuinely sweet and grounds the episode in real friendship.
The episode ends with the ticket situation unresolved, perfectly setting up the next arc.
Episode 5 – "First Time at a Women's University" (はじめての女子大)
Iori and Kohei somehow make it to the Ōmi Women's University Festival. Their plan: enjoy being surrounded by girls for once in their chaotic lives. Reality: the girls immediately rope them into helping out at the café, putting them to work in embarrassing costumes.
What follows is a masterclass in escalating comedy. Every attempt they make to enjoy the festival ends with them in a worse position than before. They cannot win. The universe itself seems designed to prevent them from having a single moment of uncomplicated pleasure. The women's university setting gives the show a fresh environment to play with, and the episode squeezes every drop of comedic potential out of it.
Chisa is present throughout and her exasperated reactions to Iori's suffering are particularly enjoyable here — there is a softness to her irritation that feels different from earlier episodes.
Episode 6 – "Back to the All-Girls College" (ふたたびの女子大)
The Women's University arc continues and things get considerably messier. Iori and Kohei find themselves even more deeply entangled in the festival chaos, with misunderstandings multiplying at an alarming rate. Attractions develop, get complicated, and get misread — exactly the Grand Blue formula, executed at full speed.
The episode is essentially a showcase for how well the show handles comedic escalation. Each misunderstanding does not resolve; it compounds. By the time the episode ends, there are so many simultaneous miscommunications happening that the audience is laughing not just at each individual moment but at the beautiful structural absurdity of the whole situation.
Episode 7 – "Expelled" (退学)
In what might be the most insane premise of the season: Iori and Kohei get expelled from university. Not temporarily suspended. Actually expelled. This is Grand Blue, so the reason is both completely their own fault and somehow not entirely their fault at the same time.
The rest of the episode is them desperately devising plans to get back in. Every plan is creative, none of them are sensible, and each attempt results in a new disaster. The episode taps into a very real anxiety — being kicked out of school — and plays it for pure comedy while never quite losing the thread of these being real consequences for real (if fictional) people.
Kohei's plans in particular reach new heights of absurdity here. His otaku brain applies anime logic to real-world problems with completely predictable and hilarious results.
Episode 8 – "Dangerous Experiment" (危険な実験)
Back in academic life (somehow), Iori and his classmates face a cooperative class assignment that requires genuine teamwork — a chemistry or physics-adjacent experiment that is described as genuinely dangerous if handled incorrectly. The comedy here comes from watching a group of people who cannot organize themselves to save their lives being forced to work together on something that actually requires precision and care.
The episode also develops Iori's relationships with his classmates further, giving secondary characters more breathing room than they got in Season 1. The dynamic among Iori's class is one of the warmer parts of the show, and this episode leans into that warmth while still being very funny.
Episode 9 – "Familiar Face" (見知った顔)
Iori picks up a part-time job and immediately runs into someone from his past — someone whose presence complicates things significantly. The "familiar face" encounter creates a new source of social tension that the episode mines expertly.
At the same time, the romantic threads of the season start pulling tighter. The episode ends with a genuine cliffhanger: Aina asks Iori out on a movie date — just the two of them. This is not a group hang. This is not an accident. She is being sincere and direct, which in this world of chaos and misunderstanding is almost revolutionary. The episode cuts there, leaving the audience hanging on what Iori will say.
Episode 10 – "Misunderstandings" (誤解の連鎖)
The fallout from Aina's confession-adjacent invitation ripples through the group. Misunderstandings multiply in all directions — people assume things, interpret things wrong, and share information that gets distorted. The romantic geometry becomes temporarily very complicated, with Iori caught in the middle trying to be decent to everyone and somehow making it worse.
Iori does go on the movie date with Aina. It is sweet. It is also interrupted, misread by observers, and turned into something much bigger than it was. But there is a quiet moment between the two of them — a genuinely tender few minutes — that gives the show some real emotional texture. Aina's feelings are treated with respect here, which matters.
Meanwhile, Chisa receives some news that the episode does not fully spell out but clearly affects her. Her expressions throughout the episode are doing a lot of work. The show is very deliberately not rushing anything — but something is shifting.
Episode 11 – "Let's Go to an Uninhabited Island!" (無人島へ行こう！)
The entire Peek-a-Boo club heads to a camping trip on an uninhabited island. This sounds like a recipe for peace and nature. You know it is not. Upon arrival, they run into unexpected people — other groups with their own agendas — which immediately turns a supposedly relaxing trip into a full-scale social disaster.
The island setting is gorgeous. The animation team clearly had fun with the scenery — golden beaches, clear water, dramatic skies at sunset. It is the kind of setting that the show uses to great effect as a contrast against the human chaos happening in the foreground.
The group dynamics on the island are fantastic. Stripped of their usual environments, characters interact differently. Old tensions surface. New alliances form. And then, because this is Grand Blue, someone starts a drinking competition that spirals completely out of control.
Episode 12 – "The Bond That Shifts" (Season Finale)
The finale is built around one extraordinary accident and its consequences. On the uninhabited island, Chisa gets completely drunk and collapses into the sea, ending up soaked. She retreats into a tent to change — and Iori, with spectacular timing, accidentally walks in on her. He sees her. She knows he sees her.
As punishment for the incident, Iori is exiled to survive alone at the bottom of a cliff for a period. It is played for comedy — and it is very funny — but there is something genuine underneath. When he is eventually rescued and the camp ends, something has changed. Chisa starts avoiding Iori. But crucially, she does not seem angry. She seems... flustered. Uncertain. Like someone processing feelings she has not had to process before.
Iori, reading the room better than he usually does, tries to reach out to her using diving as the excuse — because diving is their shared language, the thing they both love genuinely. The season ends with this moment of tentative connection hanging in the air. The "sibling-like bond" that has defined their relationship all season is clearly becoming something else. The show does not name it. It does not need to. The audience feels it.
And then — after the credits — the announcement. Season 3 is coming. Palau is waiting. The story is nowhere near over.
New Character Spotlight – Shiori Kitahara
Season 2 adds one major new character, and she is an absolute standout.
Shiori Kitahara is Iori's younger sister, and she arrives with a clear mission: drag him back home to run the family inn. What makes her extraordinary is the gap between her obvious intelligence and her chosen methods. She is clearly capable of sophisticated thinking, but she commits to the most unhinged plans imaginable with complete conviction.
Her decision to pretend to be romantically obsessed with her own brother — equipped with actual surveillance gadgets — as a strategy to get him to leave university is the kind of plan that only works in an anime comedy. And the show knows this, playing the absurdity fully while also giving Shiori genuine moments of real emotion. She cares about her brother. She just expresses it through theatrical chaos.
Critics and fans immediately fell in love with her. She provides something Season 1 never quite had: a proper comedic antagonist with actual motivation. She is not just a friend being difficult. She has a goal, a plan (terrible as it is), and the stubbornness to see it through. By the time she eventually backs off — after seeing how much Peek-a-Boo genuinely means to Iori — it feels earned on both sides.
Returning Characters – How Everyone Grew
Iori Kitahara
Three months into his Grand Blue life, Iori is more comfortable in the chaos but no less susceptible to it. What Season 2 adds to his character is a growing emotional awareness — particularly around Chisa. He starts actually noticing things, reading situations slightly better, and making choices that reflect genuine care rather than just self-preservation. He is still an absolute disaster in most situations, but there is a maturity developing underneath.
Chisa Kotegawa
Season 2 is enormously important for Chisa as a character. The revelation that she and Iori are not blood-related reshapes the entire emotional landscape of their relationship. Her behavior shifts subtly across the season — moments of unexpected warmth, times where her composure slips just slightly in Iori's presence. The finale's aftermath, where she is clearly flustered rather than angry, is the clearest signal yet that her feelings are becoming complicated in ways she has not dealt with before. This is handled beautifully — never forced, always earned.
Kohei Imamura
Kohei remains consistently brilliant comedy material. His otaku logic, applied to increasingly real-world situations, produces some of the funniest moments of the season. He is also used more cleverly as a foil in Season 2 — sometimes his social obliviousness accidentally creates the perfect conditions for genuine moments between other characters, making him oddly important to the emotional beats of the season.
Aina Yoshiwara
Season 2 is Aina's most emotionally significant stretch of story so far. Her feelings for Iori are treated seriously — she is not played as a joke or as an obstacle. Her decision to directly ask Iori out is a moment of real bravery given how chaotic and overwhelming the Grand Blue environment usually is. The show respects her enough to let her confession arc breathe and have genuine weight.
Nanaka Kotegawa
Nanaka gets considerably more spotlight in Season 2, particularly her drunk behavior in Episode 4, which becomes legendary within the episode almost immediately. She remains the warm, grounding presence of the club while also demonstrating she can be just as chaotic as everyone else when the right conditions are met.
Tokita and Kotobuki
The senior duo continues their reign of loving terror over Iori and Kohei. Season 2 uses them a bit more sparingly than Season 1, which actually makes their appearances hit harder. When they show up to engineer chaos, it feels like an event. Their genuine affection for the juniors is a little more visible this season — they are still monsters, but fond ones.
Themes and Highlights – What Season 2 Does Differently
Growing Up Without Losing Yourself
Season 2 is quietly about what it means to settle into a life you did not plan on. Iori came to university with certain expectations. Grand Blue shattered all of them. Season 2 picks up at the point where he has accepted this — not reluctantly anymore, but genuinely. The arrival of Shiori forcing him to confront "should I leave" gives the season its emotional spine. His choice to stay, expressed not in words but in how he lives, is the season's most important statement.
The Romance Finally Starts Moving
Season 1 planted seeds. Season 2 waters them. The not-blood-related revelation, Aina's direct confession approach, and the finale's accidental intimacy between Iori and Chisa all push the romantic threads forward meaningfully. The show still does not rush anything — this is not a romance anime and it knows it — but it is no longer content to simply hint. There is forward movement, and it gives the season emotional stakes that Season 1 did not quite have.
Improved Animation Quality
The addition of Liber to the production makes a visible difference. The comedy expressions — those extreme, distorted, hilarious faces that Grand Blue is famous for — are more dynamic and creative. The underwater scenes are breathtaking, with color work and fluid movement that rivals anything in the diving genre. And the background art for the island sequences in the final episodes is genuinely stunning.
Shiori as a Narrative Device
Beyond being funny, Shiori's presence forces the question: what does Iori actually want? Before she arrived, he was just living day to day in the Grand Blue chaos without having to articulate why. Her challenge makes him examine his own feelings about this life, these people, and this place. That examination is what gives Season 2 a slightly more mature emotional texture than Season 1.
The Highlights
Shiori's first appearance and her gadget-equipped stalking mission. The blood-relation reveal and Aina's immediate reaction to it. The entire Women's University Festival arc, which is sustained brilliance across two episodes. The expulsion arc's sheer absurdist energy. Chisa drunk-collapsing into the ocean in the finale, followed by the tent incident and its emotional aftermath. And of course — the Season 3 announcement at the end, which genuinely felt like a gift after a seven-year wait.
Production Details – The Numbers and the Team
Season 2 ran for 12 episodes, matching Season 1 exactly. It aired from July 8 to September 23, 2025, making it a complete Summer 2025 anime. The original manga the season adapts from was at 24-26 volumes during production, with plenty of material remaining.
Director Shinji Takamatsu — best known internationally for Haven't You Heard? I'm Sakamoto — returned to write and direct, maintaining complete creative continuity from Season 1. His style is the DNA of Grand Blue: comedic escalation, perfect timing, and a genuine eye for quiet emotional beats hidden inside loud comedy.
The season was among the most anticipated of Summer 2025, and the almost immediate leak of the full series via piracy sites (in 480p, with no watermarks) before its official global premiere generated significant controversy in the anime community — but did not dampen enthusiasm for the show itself, which went on to score impressively on every major fan rating platform.
Conclusion – Was It Worth the Seven-Year Wait?
Yes. Without a single hesitation.
Grand Blue Dreaming Season 2 does everything right. It does not try to reinvent the show or prove itself by abandoning what worked. It walks back into the room with the confidence of something that knows exactly what it is and trusts that you still love it — and then it proceeds to be everything you hoped for plus a little more.
The comedy is still the best of its kind. The characters have grown in ways that feel natural. The new addition of Shiori gives the season a shape and emotional direction that Season 1, great as it was, never quite had. The romance threads finally have momentum. And the animation quality is genuinely better than before.
Seven years is a long time. A lot of anime return from long hiatuses and disappoint, either by changing too much or not changing enough. Grand Blue Season 2 threads that needle perfectly. It is the same show you fell in love with, plus the wisdom of knowing exactly what it needs to add.
By the time the Season 3 announcement hit — set in fictional Palau, premiering July 2026 — the feeling was not surprise. It was inevitability. Of course there is more. There should be more. These characters and this world deserve more.
If you have not watched Season 2 yet, you are in for a great time. And if you just finished it and are already feeling the wait for Season 3 — welcome to the club. We have drinks. (Responsibly sized ones. Mostly.)
FAQ – The Questions Everyone Is Asking
Q: Do I need to watch Season 1 before Season 2?A: Absolutely yes. Season 2 drops you directly into the established world with no re-introduction. The characters, relationships, and internal logic of the Peek-a-Boo club are all assumed knowledge. Going in without Season 1 means you will miss half the context and most of the emotional payoffs. Season 1 is on Crunchyroll now — watch it first.
Q: Where can I watch Grand Blue Dreaming Season 2?A: Season 2 streams on Crunchyroll with English subtitles. Season 1 is also on Crunchyroll. Southeast Asian viewers can find it on the Tropics Anime Asia YouTube channel as well.
Q: Is the animation better in Season 2?A: Yes, noticeably. The addition of Liber alongside Zero-G gives the production more resources and it shows — particularly in the comedy face expressions, which are sharper and more creative, and in the underwater sequences, which are genuinely beautiful.
Q: Who is Shiori and do I need to like her?A: Shiori is Iori's younger sister and the main new character of Season 2. You will like her. I promise. She starts as an apparent antagonist and ends as one of the most lovable characters in the show. Give her the first two episodes.
Q: Does the Iori-Chisa relationship go anywhere in Season 2?A: It moves forward more meaningfully than Season 1. The not-blood-related reveal changes the emotional stakes significantly, and the finale genuinely shifts the dynamic between them. It is still a slow burn — this is not a romance anime — but things are definitely moving. Season 3 will likely push it further.
Q: What about Aina? Does her storyline get resolved?A: Her feelings are addressed more directly in Season 2 than ever before, and her arc is treated with real respect and sincerity. It is not fully resolved — the romantic geometry of this show is too complex to wrap up cleanly in one season — but she gets genuine, meaningful screen time and emotional development.
Q: Is Season 3 really happening?A: Yes. It was confirmed during the final episode of Season 2. Season 3 is set in a fictional version of Palau, is being produced by Zero-G and Saber Works, with Takamatsu returning as director. It is scheduled to premiere in July 2026. Mark your calendars.
Q: Is Season 2 better than Season 1?A: That is a personal call, but Season 2 is at minimum equally as good and in several ways stronger — the animation is better, Shiori is a brilliant addition, and the emotional arcs have more forward momentum. If Season 1 is a 9/10 for you, Season 2 is a 9/10 or higher. It does not disappoint.
Thanks for reading all the way through! If this post helped you, share it with someone who is on the fence about watching. And if you have already watched Season 2 — drop your favorite moment in the comments. Mine is Chisa dramatically falling into the sea. Zero notes.
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