Here it is: the Vlad Love Beach episode. When the Blood Donation Club requests a “training camp” trip to cut loose, Chihiro brings up the club’s utter lack of a budget. No problemo; Kaoru finds a steal of a deserted tropical island vacation: just ¥10,000 (bout $90) per person.
Unfortunately, the low cost means they travel by boat, and end up in a homage to The Great Wave off Kanagawa with crippling seasickness; only Mai seems to be having fun. However, they do eventually make it, and the summer sun, white sands and blue sea deliver as advertised.
As the sun sets, everyone save Nami (who goes for a solo swim in the ocean) check out their dilapidated accommodations, which are in such a state due to the immense age of the innkeeper and sole employee, the tiniest of obaasans. When Jinko searches the beach after sundown, Nami is nowhere to be found, save her swimsuit, which means wherever she is, she’s nakked.
The obaasan innkeeper tells them the legend of a Fishman who for five hundred years has been visiting the beach on hot summer nights ever since he and his true love, a beautiful young human woman, were separated. Maki goes on a Creature of the Black Lagoon tangent, but the group decides to head out to the beach and lure the Fishman out, and rescue Nami from his clutches.
After Kaoru dancing erratically in fishgirl cosplay yields no results, everyone agrees, and Mai volunteers, to be the blonde bait sea creatures seemed to love so much in the movies. Tied up like Andromeda as an offering to Cetus, the Fishman emerges from the waves: a hilariously awkward giant beast with the head and body of an eel and muscular human legs—more Trogdor than Gill-Man.
When Katsuno cosplaying as Perseus is smashed under the Fishman’s foot, an 80% charged Franken is activated and transforms into Hulk Mode. In his somewhat lest than three minutes of operating time, he’s able to give the larger Fishman a German suplex, knocking him out cold. The battle is too brief and uneventful to be deserving of the cool poster that flashes on the screen.
Back at the inn there was a running gag of the tiny old innkeeper’s yelling literally bringing down pieces of the inn. It’s revealed she was the woman who fell for the Fishman 500 years ago, and the sight of him unconscious leads her to let out a scream that causes the entire island to explode, ripping everyone’s clothes and giving everyone fluffy perms.
The final loose end is Nami, whom Mitsugu had completely forgotten about as she’d been too busy worrying about Mai. Turns out she’s fine too, as the fisherman’s daughter emerges from the Fishman’s mouth naked but otherwise unharmed and unfazed. The group lines up on the beach to watch the Fishman swim out into the sunrise.