Yukari, a 40-year-old widow who lost her husband years ago, one day catches her son masturbating. This incident awakens her suppressed sexual desires, driving her to assault him. After crossing the line into an incestuous relationship, Yukari becomes consumed by forbidden passion, torn between her overwhelming lust and inner turmoil. The story portrays her everyday life, highlighting the intense conflict between primal urges and moral boundaries, delivering a deeply emotional and gripping narrative.