Junya and Sanae are a young couple who just started dating. Everything is going well, and today is their first sleepover and their first time having sex!? Just as she was feeling excited, Junya tells her that he can't have sex with her. Sanae feels awkward and can't ask him the reason, but they end up in the same bed, but she wants to sleep close to him. Then, she feels something incredibly hard and big against her waist...!?