Her relationship with her stepson becomes increasingly entangled, and as Rin struggles with her role as a second wife, she finds herself harboring intense emotions deep within. While she wishes to preserve her bond with her husband, her physical connection with her stepson continues uncontrollably. Tormented by guilt and self-reproach, she realizes he has awakened to pleasure and grown even more drawn to her. Despite verbally resisting, Rin's heart and body are already beyond return. How will she reconcile her duties as a mother and her position as a stepmother?