Youkai Gakkou no Sensei Hajimemashita!: Season 1, Episode 8

1 - 8: Amaaki, Momoyama-san, and the Nudity Festival

Amaaki, Haruaki's twin brother, takes his place and becomes a teacher for a day. Soon after, Yanagida's love potion cause havoc at the school. And to finish the episode off, the whole class goes to a public bath.