Arisa (Misaki Kanna), raised in a single-parent household, lives with her mother Michiko (Kanou Ayako). Her mother works at a supermarket during the day and at a snack bar at night to support their finances. One day, her drunk mother returns home with a man. It's the first time Arisa sees her mother as a woman, and it's also her first encounter with a male presence... Soon after, her mother remarries that man, Sakai Osamu. An awkward life of three begins. For Arisa in her puberty, her stepfather's seemingly innocent behavior stirs something deep within her body. Even though she should hate him, why does her body crave the scent of a man?
