At the Faculty Room Toilet… / Secret Lesson / Events in the Locker Room - S1.E1

The episode shows Academy professor Hiroko Takashiro getting aroused while being reminded of her demonic encounter in her youth. She relieves herself in a bathroom stall and is attacked by the vice-principal, eventually giving in. Next, student Mika Ito has sex with a boy and later spies on swim team members Kobayashi and Mikimoto, who are abusing their fellow swimmer Miyuki Nonogusa. She and her male friend join them to have an exuberant orgy. Finally, student Kaori Saeki has sex with two boys who join her in the swimming pool's shower room.