Living alone with her stepson, Yoshio, while her husband is away on assignment, Yuri finds herself increasingly drawn to the young man as he matures into a confident, attractive man. Though conflicted, she can't ignore the growing attraction. Meanwhile, Yoshio harbors secret feelings for Yuri, indulging in fantasies about her. As Yuri is tempted by advances from old friends, Yoshio grows consumed by jealousy and desire. Their twisted emotions spiral, blurring the lines between longing and betrayal, leaving their future uncertain.