Satsuki is a classical literature teacher at a certain academy, always careful in her interactions with her teenage students. However, she begins to realize that one of her students, Yamanoi, has developed romantic feelings for her. One day, when Yamanoi insists on receiving private tutoring, Satsuki invites him to her home. During their conversation, he confesses his love for her, and the two cross the line. But this decision brings a drastic and life-altering consequence for Satsuki.