To help her husband Takeshi, who was struggling with debt due to business failure, married woman Rena decided to return to her parents' home. Returning home after a long absence, Rena reunited with her mother Shuri and her stepfather, Kenichi, who had remarried after Shuri's divorce. Though Kenichi readily agreed to let her stay, as days passed under the same roof, his true nature began to surface. Despite her resistance, Rena found herself unable to escape Kenichi's embraces. Gradually, a lustful relationship developed between stepfather and stepdaughter. Watching this unfold, Shuri felt conflicted deep inside, yet silently looked on.