A Terrified Teacher at Ghoul School! season 1 episode 8
Episode title: 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.
