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A night of mistake with her father-in-law while her husband was away. What will become of Satomi, a wife who cannot forget it? Her father-in-law is coming to Tokyo to rebuild the family home, but the dates overlap with her husband's business trip, so Satomi, a married woman, ends up living alone with her father-in-law. Though she is anxious, her daily life is peaceful, but one drunk night, her father-in-law attacks her in her sleep. Even when her husband returns from his business trip, her heart is still not at peace. That's because she cannot forget that night with her father-in-law.