Grand Blue finishes up with the club traveling to Miyakojima, which despite being part of Okinawa Prefecture is a 190-mile flight away from that island. The far-flung locale is not only home to the tradition of “Otori” (endless drinking) but some great diving spots, which the gang reaches by powerboat—only Iori can’t join the others since he missed his chance to get certified with Aina and Kouhei.
Chisa can see that Iori seems down and left out, and so stays behind on the third of three dives to cheer him up. Turns out he’s not that blue; he’s green from seasickness aboard the boat. Even so, the two have a nice time together.
That night, with the planned restaurant closed, Ryuu, Shinji, and their heavy-drinking compatriots set up an impromptu Otori, with everyone adding their chosen alcohol to a huge earthenware pot to share throughout the night. Iori and Kouhei aren’t really up to this level of drinking, but their senpais emphatically insist, and won’t allow them to dilute the concoction with water.
They soon run out of booze, and so the only non-buzzed member, Aina, heads out to buy more. She conscripts Iori to help her with the load, but he hops in the van wearing nothing but boxers, which even on the tropical island elicits a stop by the police.
Upon returning to the party Aina accidentally takes the wrong cup from Azusa and downs it in one gulp. Turns out it’s the near-lethal Otori Juice, and she instantly becomes tanked, losing her inhibitions and going after Iori and Kouhei’s boxers.
While briefly escaping her clutches, Kouhei curses Iori for tricking him into joining the club, but Iori points out to him that by joining he actually got what he wanted: a fun, exciting, almost dream-like first year of college. Just before Aina leaps out from the darkness Kouhei considers it more of a nightmare.
With that, the gang heads back home, passing the time looking at photos of their time in Miyakojima, which bring smiles to all, even Chisa, for whom the antics of Iori, Kouhei & Co. have warmed to her somewhat. It’s as good a place to end as any; Grand Blue was in danger of too often repeating its themes without sufficient development of relationships to justify more episodes.
Ultimately, while the actual diving scenes were certainly beautiful and aspirational, they weren’t the most numerous, and always took a backseat to the drinking, arguing, and weird, exaggerated distorted closeups of peoples’ faces. It wasn’t without its share of laughs and heartwarming moments, including Chisa’s final smile.