Every time her daughter brings her boyfriend home, Yuzuki, the mother, peeks into her room, worried that she might be doing something impure. However, her concern for her daughter gradually overlaps with her own sexual frustration, and she begins to feel aroused... One day, Yuzuki peeks at her daughter and her boyfriend having sex, and is unable to suppress her desire that is on the verge of exploding, and finally begins to seduce him...