Atsuko Misaki is an actress working professionally with Yusuke. To further her career, she asks him to help rehearse a role where she plays an unfaithful woman involved with a married man. During these rehearsals, their professional relationship becomes physical, marking her loss of innocence. This encounter begins a sustained romantic and sexual relationship between them. Misaki actively pursues this relationship with increasing frequency, seeking deeper emotional and physical connection. Her actions create significant tension within Yusuke's marriage, establishing her as a catalyst for marital conflict. Her narrative centers on this extramarital dynamic and its consequences.