Yuuji usually goes home alone on the train after working at a convenience store, but this time it's different. This is because the slime life form he lives with has transformed into his colleague Takamiya and is at his place of work. Yuuji is relieved to have finished his work without encountering Takamiya himself, but the slime life form happily talks to him while still transforming into Takamiya. Because of this, he gets in trouble with the girl standing next to him. She makes fun of Yuji and angers the slimy life form, but Yuuji apologizes and calms down the situation. Yuuji, who is calming down in his bathroom, there is a slimy creature who can't control her anger, she transforms into the girl from earlier in order to correct Yuuji's outspoken personality. Her transformed appearance was in a competitive swimsuit, as she belonged to the swimming club. Despite Yuuji's surprise, the slimy life form split and transformed into Takamiya in a competitive swimsuit. It becomes difficult for Yuuji to suppress his sexual desire as he sees the two of them in competitive swimsuits.
