Rin remarried and began living with her new husband and his son, forming a family of three. Though her husband was kind and their life seemed happy, she struggled with her relationship with the stepson. Six months passed, but she couldn't grow closer to him. One day, she visited his room on his day off, proposing they do yoga together and asking for his help. In that moment, the son became aroused by Rin's appearance and suddenly made a move. Surprised, Rin is then told by him that he's seen her as a woman since the very first day they met—triggering an intense shift in their relationship.