A simple university discussion somehow turns into a courtroom, a relationship debate, and one of the funniest class sessions imaginable before the diving club celebrates the end of summer in typical Grand Blue fashion.
The episode 1 of Grand Blue Season 3 starts with a classroom exercise at Izu University where students are instructed to form groups and discuss an everyday problem along with possible solutions. Instead of choosing an ordinary topic, the discussion immediately focuses on Shinichiro Yamamoto's virginity, leaving him completely shocked as everyone around him begins treating his personal life like an academic assignment.
Rather than showing any sympathy, the group seriously brainstorms ways to solve what they call Yamamoto's "problem." Their first suggestions quickly become more ridiculous than practical, with some proposing money while others throw out completely unacceptable ideas. Yamamoto desperately argues that simply getting a girlfriend should be the obvious answer, but even that suggestion gets twisted into another absurd proposal. Every new opinion pushes the conversation even further away from common sense.
One student questions whether criminal methods should even be considered, leading the group to agree that such options violate basic morality. That briefly makes it seem like the discussion is finally returning to reality, but the moment doesn't last long. Since none of their ideas appear workable, several members conclude that Yamamoto's situation is simply impossible to solve, frustrating him even more.
The discussion takes another unexpected turn when someone explains that if a problem cannot be solved directly, the goal itself should be approached differently. To illustrate the idea, they compare it to riding a bicycle with a flat tyre. Instead of fixing the bicycle, they suggest simply running instead. What begins as a reasonable example instantly turns into another outrageous argument when they ask whether a romantic partner even has to be human.
Yamamoto immediately rejects the bizarre conclusion, but the others continue presenting increasingly strange "scientific" explanations. One student even compares measurement errors in science with the genetic difference between humans and gorillas, using that comparison to defend the completely ridiculous suggestion. Yamamoto can only stare in disbelief as the group confidently presents one unbelievable argument after another.
The debate shifts once again when another student questions whether Yamamoto actually needs to lose his virginity at all. They claim the original purpose of reproduction should be reconsidered, speaking as though they are delivering a serious academic presentation. Yamamoto finally realizes everyone else seems far too comfortable discussing the subject, making him suspect that they all have more experience than he does.
Just when it looks like the conversation might finally move on, Imamura introduces a completely different problem. He proudly points out that unlike everyone else, he actually has a partner, only to reveal that he merely came close to taking the relationship further. His comment immediately sparks another heated discussion.
Yamamoto proposes a brand-new topic focused entirely on the social issue of someone like Iori Kitahara having a girlfriend. The atmosphere changes from a classroom discussion into something resembling a courtroom. Participants begin debating whether Iori deserves to keep his relationship, while some openly argue that simply breaking the couple apart would solve everything.
The moderator then introduces strict rules for the debate, insisting that anyone wishing to speak must first raise their hand for permission. He even describes the discussion as both a debate and a trial, causing everyone to treat the conversation with exaggerated seriousness despite the completely ridiculous subject. Every request to speak is answered like an official court proceeding, making the entire classroom resemble a comedy version of a legal hearing.
As the accusations continue, Kitahara refuses to quietly accept becoming the target. Instead, he points out that he cannot possibly be the only suspicious person in the room. His statement immediately shifts everyone's attention toward Imamura, whose appearance alone makes several classmates believe he should naturally have a girlfriend. Imamura proudly declares that his girlfriend exists in another dimension, a confession so unexpected that the class instantly declares him innocent instead of questioning him further.
Unfortunately for Kitahara, his own attempt at self-defense completely backfires. Desperate to avoid punishment, he admits that he struggles with the exact same issue as Yamamoto and even creates a new discussion topic centered around his own virginity. Before he can change the subject again, time runs out, forcing the group to present its official conclusion in front of the class.
Instead of feeling embarrassed, the presentation only creates more misunderstandings. Other students begin discussing Kitahara's relationship with Kotegawa, wondering why nothing has happened between them. Some assume she never allows him to get close, while others express relief that nothing has changed yet. Meanwhile, Kitahara can only watch as the entire conversation spirals completely beyond his control, turning his private life into the most popular topic in the classroom.
The story then shifts away from the classroom as the senior members of the diving club begin talking about the approaching end of summer. Since graduation and future responsibilities are getting closer, they ask each other whether there are any "loose ends" they still want to take care of before the season is over. Everyone quickly starts sharing ideas, with requests ranging from seeing everyone dressed in proper yukatas to holding a memorable drinking party and enjoying a takoyaki gathering together.
The group happily agrees on combining those ideas into one final celebration. They begin planning the menu while shopping, discussing different takoyaki fillings such as shrimp, cheese, sausages, mentaiko, kimchi, and even sweet pancake variations. Their lively conversation makes everyone look forward to the party as they continue adding more ingredients to the list.
Once everyone gathers, the celebration officially begins with a toast to wrapping up summer. Freshly cooked takoyaki and cold beer immediately become the center of attention, with everyone enthusiastically enjoying the food. Different cooking styles are introduced, creating a cheerful atmosphere that perfectly matches the club's tradition of turning ordinary gatherings into unforgettable events.
One member even brings along a camera, hoping to preserve the memories from what everyone expects to be their final major summer party together. However, the seniors quickly explain that simply recording the event is not enough. They reveal a written list of everyone's unfinished summer wishes and announce that every single request will be fulfilled during the party.
That announcement completely changes the mood. Since one request specifically mentions wearing proper yukatas, the conversation turns into a debate about what "proper" actually means. Azusa confidently explains an old custom associated with yukatas, causing the entire group to react with complete disbelief. Even Iori becomes the target after someone notices he is actually wearing a jinbei instead, forcing him into another embarrassing situation while everyone else watches with amusement.
With that chaos behind them, attention returns to cooking. The seniors casually reveal what they call "Pab-style" takoyaki, and everyone immediately realizes something is terribly wrong. Instead of using ordinary water in the batter, they substitute it with alcohol. The result is a mixture that behaves nothing like normal takoyaki batter, separating during cooking, burning easily, and even producing dramatic flames whenever it comes into contact with fire.
Despite all the obvious warning signs, the group finishes cooking and proudly presents the final product. Unfortunately, the takoyaki turns out dry, brittle, and completely unappetizing. Even those who prepared it hesitate before taking a bite, yet they convince themselves that heating must have reduced enough alcohol to make everything acceptable.
Things only become more awkward when Chisa accidentally ends up with one of the finished takoyaki. After tasting it, she honestly admits that it is awful, but also points out that someone still has to eat it. Instead of letting the food go to waste, she suddenly decides to feed Iori herself, explaining that since they are technically still a couple, she should occasionally act like a proper girlfriend.
Iori desperately tries to escape the situation, but Chisa continues insisting while everyone around them watches with great interest. The teasing becomes even worse when someone secretly photographs the moment as potential blackmail material, making Iori panic even more. What begins as a simple attempt to share food quickly develops into another loud argument, with both of them trying to force the unpleasant takoyaki onto each other instead.
Unable to settle the dispute peacefully, the club falls back on its usual solution—a competition. Multiple games are prepared, including drinking challenges, takoyaki eating contests, and beer chugging. However, the joke becomes obvious when nearly every category somehow involves alcohol, making the supposed "water" challenge no different from the others.
After all the games and laughter, the seniors quietly reflect on the evening. They agree that every summer wish has finally been fulfilled, allowing them to move forward toward job hunting, graduate school, and other responsibilities without any regrets. Although they proudly describe it as a drinking party they will always remember, someone jokes that the younger members may actually struggle to remember much of it after everything they consumed.
The episode ends with the morning after the party as Nanaka tells Iori that the Dolphin diving shop has opened a new location in Palau and urgently needs temporary staff. Excited by the opportunity, Iori immediately agrees, and Chisa is equally enthusiastic about the chance to dive overseas. Kohei initially hesitates because he refuses to miss his favorite anime broadcasts, but eventually accepts after learning the job could help him gain diving experience and purchase equipment at a better price. Only then does he realize the work requires traveling abroad, leaving him horrified after discovering Iori has already accepted on his behalf. To make matters even more complicated, Iori learns his passport is still back at home, forcing him to ask his younger sister to send it before the episode closes by teasing an upcoming trip home and the long-awaited introduction of Shiori.
Episode Verdict
Grand Blue Season 3 Episode 1 delivers exactly the kind of outrageous comedy fans expect. The classroom discussion is packed with nonstop jokes, while the second half balances ridiculous drinking party antics with genuinely warm moments between the club members. The closing setup for the Palau trip also gives the episode a strong sense of momentum, making it an entertaining premiere that smoothly transitions from pure comedy into the next adventure.
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