Yua, a college literature student, struggles to find a part-time job until she receives a tutoring offer through her mother's friend and decides to take the position. On her first day, she realizes her young student, Shota, is attracted to her breasts. At the suggestion of Shota's mother, Yua agrees to stay overnight. From that night on, Shota begins various naughty pranks in the bathroom, kitchen, and bedroom. What started as a simple extension of her part-time work gradually develops into a deeper relationship.