The episode opens with the Palau gig winding down, and the group already settling into that end-of-trip melancholy. Kouhei mentions tomorrow is the last day, Iori says it flew by, and then a customer immediately starts causing trouble. This is the first time we see Chisa actually working as staff rather than playing a difficult customer, and it goes about as well as you’d expect.
A middle-aged diver tries to jump from the boat instead of using the ladder. Chisa tells him it’s dangerous. He snaps back that he’s been diving since before she was born and doesn’t need lectures from a brat. Chisa fires back that overconfidence is the leading cause of injury. The guy gets angrier. Iori steps in, smooths things over by appealing to the guy’s ego while pointing out that beginners might copy his bad example. The customer backs down, uses the ladder, and everyone praises Iori.
Maki even says Iori has the right personality for the job, then adds he’s “unlikely ever to graduate college.” Iori’s indignant “I’ll graduate! Just give me six years!” is exactly the kind of defensive energy that makes him endearing despite everything.
The chief cancels the next day’s dive because the clients got food poisoning, but instead of making the group unload the gear, he suggests they go fun-diving themselves. This is a small but meaningful moment. Chisa has been diving every day for work, but the chief points out that diving with friends is different from working. Iori piles on with a callback to the blue-ball explosions, and Chisa’s “Anything but that!” shows she’s still the same person underneath the professional exterior.
The dive itself is where the episode finds its emotional center. They see a manta ray up close, and Chisa admits it’s her first time seeing one that near. The group’s excitement is genuine, and Chisa’s quiet “I think so too” when Iori says diving is special lands because she’s been treating it as a job the whole trip. The chief’s conversation with her afterward drives the point home: if you want clients to have fun, you have to have fun too. The same applies to talking with people. If you want a heart-to-heart, you have to speak from the heart.
This sets up the episode’s real conflict, which isn’t about diving at all.
Chisa and Sayaka Are the Same Person in Different Fonts
The mother-daughter tension that’s been simmering since they arrived finally boils over. At the farewell dinner, Sayaka bluntly tells Chisa she’s not cut out to be an instructor. Chisa snaps at her in front of everyone, then apologizes to the group and storms off. It’s uncomfortable in a way Grand Blue rarely is. The show usually lets its conflicts play out through absurdity, but this one is just two stubborn people hurting each other.
Iori tries to mediate. He tells Chisa to apologize, and she does, genuinely. She says she understands her mom is worried, but she still wants to be an instructor. She promises to study hard and graduate college. It’s a sincere, vulnerable moment.
Sayaka’s response is to pretend she didn’t hear anything. “You say something, Chisa? If you don’t need anything, could you leave? I’m busy.”
It’s brutal. Chisa walks away, and the next time we see her, she’s smiling in that way that Aina immediately recognizes as “out for blood.” The episode doesn’t soften this. Sayaka’s rejection isn’t played for comedy. It’s just a mother and daughter who can’t communicate.
Iori confronts Sayaka afterward, telling her she was mean. She brushes him off too. But then something happens that Iori notices and files away.
Iori Actually Pays Attention for Once
When a business call comes in, Iori holds the phone up to Sayaka’s ear. She drops what she’s holding to switch the phone to her other ear. It’s a tiny detail, but Iori can’t let it go. He misses the flight home to go back to the shop and ask the chief about it.
The answer changes everything. Sayaka is deaf in her left ear. She used to be an instructor, and like many divers, she pushed through ear pressure problems instead of resurfacing. One too many times, and her eardrum blew out permanently.
The chief explains that instructors are supposed to resurface when they can’t clear their ears, but most just stay down and deal with it. Sayaka did that until she couldn’t anymore. And she never told Chisa because she didn’t want to hurt her love of diving.
This reframes every interaction between them. Sayaka’s harshness wasn’t cruelty. It was fear. She knows exactly what can happen to a diver who pushes too hard, because she lived it. And Chisa, who already has ear problems of her own, is following the same path.
Iori delivers this information to Chisa through the door of her room, late at night, after missing his flight. He tells her that she and her mom are alike. They both have the same ear problems, and they both suck at expressing themselves.
Chisa’s response is quiet. “Mom…” Then, after a pause, she asks Iori if he missed the flight for her. He says yes, and also to grab his porn mag. She thanks him, and for once, she means it without any deflection.
The Porn Mag Running Gag Gets a Weirdly Sweet Payoff
Maki gave Iori a porn mag as a souvenir, which he left behind at the shop. Aina gets a call about it and says “He’ll live.” Then Iori runs off shouting “That’s it!” and misses the flight. The group assumes he went back for the magazine.
He did, but not just for that. The mag was the excuse, or maybe the secondary objective. The real reason was to ask the chief about Sayaka’s ear. The episode plays this as a joke at first, with Aina fuming that Iori would miss a flight over a porn mag, but the reveal recontextualizes it. Iori’s priorities are still ridiculous, but underneath the idiocy, he cared enough to investigate something that was bothering him about Chisa’s mom.
The final scene, with Iori talking to Chisa through the door, is the quietest the show has been in a while. No screaming, no alcohol, no nudity. Just two people having an honest conversation about family. Chisa’s “I’m really glad you’re here with me” is the kind of line that would feel unearned in a lesser show, but after everything that happened in Palau, it lands.
Where This Leaves the Season
This episode does something Grand Blue doesn’t often do: it lets an emotional arc play out without undercutting it. The comedy is still there, the porn mag, the drinking, the blue-ball callbacks, but the core of the episode is Chisa and Sayaka’s relationship. The show trusts the audience to sit with the discomfort of two people who love each other but can’t say it.
Iori’s role here is interesting. He’s the one who notices the phone thing, who goes back to ask the chief, who tells Chisa the truth. He’s still an idiot, but he’s an idiot who pays attention to the people he cares about. That’s been true since his drunken speech about Shiori, and it continues here.
The season has been building toward this. Chisa’s seriousness about diving, her frustration with her mom, her ear problems from Okinawa. It all connects. The episode doesn’t resolve the conflict, Chisa and Sayaka don’t have a tearful reconciliation, but it gives Chisa the information she needs to understand her mother. That’s enough for now.
I’m curious where the season goes from here. The Palau arc is over, the group is back in Japan, and Chisa has a new understanding of her mom. Whether that leads to an actual conversation between them or just more stubborn silence remains to be seen. Knowing this show, probably both.
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