Hyakuinka, my university classmate, is a proud girlfriend who also enjoys reading. It's a miracle that he's dating someone like me. One day, Oikawa, a member of her club, invites her out for a drink. She was reluctant, but she was worried so I decided to go with her. Even if she became the target of an erotic game, I couldn't do anything because I was hiding her relationship. I fell asleep and when I woke up, I found myself having sex with Oikawa and the others...