Professor Dekapan invents a new potion that can revert someone's age, turning them back to their youth. Iyami somehow gets his hands on this concoction thinking he could get famous for his "youthful beauty". A mishap happens and it ends up in Chibita's oden. The now infected oden is coincidentally in some of the Matsuno brothers' dish, thus causing some of them to reverse their age.

Kittens inspire me too much. Why?

Ayano is sad about Senpai dating Osana until she finds a new Love and forgets all about Senpai.