One day, Tatsuo's mother unexpectedly brought home a man. The man introduced himself as Fumio, revealing he was her lover. Tatsuo felt intense resentment toward him and inwardly rebelled against the relationship. However, his mother and Fumio grew closer each day, indulging deeply in their passionate affair. Soon, Tatsuo accidentally witnesses their secret tryst. A shocking story unfolds, depicting the clash between family bonds and raw desire.