Amane is a member of the Juvenile Support Division. After somehow getting involved with the station's most popular detective, Hirasaka, the atmosphere in the station becomes tense from her male and female colleagues' unwelcome comments. Despite all this, Amane is inspired to work harder by Sasaki, the young man in her custody.

After accidentally eavesdropping while Hirasaka was on the phone, she learns a shocking secret, and everything she thought was normal starts to fall apart.

When Amane questions him about it, Hirasaka turns the tables on her. She makes him swear to never reveal her secret to anyone in exchange for letting him have his way with her. Though it's her first time, her sensitive body betrays her heart as she reaches climax after climax...