This week’s UY further expands its world, though not with more foxy alien chicks. Combining a pool episode with a beach episode, it introduces a lonely little demon living underwater who suddenly has a visitor. He happens to live at the bottom of the pool where Ataru, Lum, Shinobu and Mendou pay a visit. Since Lum’s default outfit is a bikini, it makes sense she’d pick a one-piece, while Shinobu opts for a bolder two-piece.
Even so, Mendou ignores her in favor of Lum’s new look, while both he and Ataru are distracted by Sakura in an even sultrier one-piece. When Ataru lunges at her, she rightfully pops him, and he ends up sinking to the pool’s bottom where the little demon guy lives. While Shinobu asks about Sakura’s fancy parfait, Lum is legit concerned about Ataru, who tags out when she arrives so he can surface for air.
After eating roughly a hundred parfaits, Sakura joins Mendou and Cherry in following Ataru, who swears there’s a freaky demon thing underwater. But when they reach his “home”, he’s surfaced to procure (read: steal) more snacks for his guests. Lum tags everyone to surface.
Eventually, everyone is back above water, studying the weird little guy. After all the commotion he caused making customers flee (his dad owns the pool) Mendou demands that the guy vacate the premises immediately. The others, feeling this was a bit harsh, wish the guy well as he departs, only for Ataru to find him having relocated to his family’s bathtub.
The conundrum of What To Do About The Weird Little Blue Guy continues in the second segment, and that question is answered immediately by Ataru’s mom, who asks him and Lum to take the guy to the beach and leave him there, since he’s been in their tub for a month.
Like the pool, Shinobu’s in a bikini and Lum’s in a one piece, but they’re different prints from the previous swimsuits they wore, which is a nice touch. Sakura also shows off her ability to eat massive quantities of food, but this time she’s with her fiancé Tsubame.
When Ataru tries to take the pool demon somewhere secluded, that happens to be the same spot where Sakura and Tsubame end up to be alone together. This results in Ataru, the pool demon, Mendou, Shinobu, and Lum all watching intently as the couple draw closer into a kiss that’s sadly broken up by the pool demon walking up to point-blank range to stare at them.
He apologizes to Ataru, Lum, Shinobu, and Mendou by throwing a goodbye picnic, offering food he’d procured/stolen from around the beach. Everyone eats, but they can’t be merry with the guy constantly bringing up the fact that they’re leaving him there all alone.
Throughout the background of this segment, there’s a very sweet and wholesome little vignette of a gentle little boy taking his beloved pet Pochi to the beach because he can’t keep it anymore. When all his most treasured moments with Pochi (who is never shown) flash before the boy’s eyes, he suddenly can’t go through with it anymore.
The boy races back to the beach, sees Ataru with a cardboard box, and snatches it up, thinking it’s the cardboard box containing Pochi that he left of the beach when it’s actually a second box into which Ataru put the pool demon.
Shinobu discovers the boy’s box, and opens it to reveal that “Pochi” is just Cherry. The kid had been spending all this time with (and feeding) Sakura’s uncle like he was a pet. That’s a great-ass punchline right there. No sooner do Ataru and Lum return home than they receive a postcard from the pool demon—who now goes by Pochi—saying he’s found a great new home and life with the kind boy. All’s well that ends well!