触手に溺れて― 女教師 触祭の宴 水元ゆうな

Yuna has a chance reunion with her former teacher, Yoichi, at Jajin Academy. The two were attracted to each other and started dating. Around that time, there were many cases of assault on school girls. One day after school, he encounters a female student who was assaulted and Yoichi staring at him.