Arisa (Kanna Misaki), who grew up in a single-mother family, lives with her mother Michiko (Ayako Kano). - Her mother supports her household by working at the grocery store during the day and snacking at night. - One day, her mother, who was drunk with her work, came back with a man. - The appearance of her mothers woman that she sees for the first time. - And the existence of a man who comes into contact with her for the first time ... - Soon her mother remarried that days man, Osamu Sakai. - Life with awkward three people has begun. - For the adolescent nature, the behavior of a casual father-in-law awakens the depths of her body as she begins to awaken. - Her heart should hate her father-in-law, but for some reason she wants the smell of a man ... - Eventually, Arisa sniffed her father-in-laws underwear and her pillow and learned to masturbate. - And her father-in-law also noticed such a behavior ...