Yuu lives a quiet life apart from her husband, who is away for work, with her son Yoshiro. Her routine changes when she hires Daiki, a private tutor. When Daiki brings his friends over for study sessions, the men become increasingly captivated by Yuu's allure, and their behavior grows more suggestive. Forbidden feelings develop between Yuu and Daiki, drawing them into a deeper, illicit relationship that soon involves his friends. Torn and confused, Yuu finds herself unable to resist their desires, gradually surrendering her body and stepping into increasingly intimate encounters.