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Reiko, who married her husband who had a divorced child (Shoji) 22 years ago, gave birth to Taku three years later. Reiko intended to treat her two sons equally, but Shoji was dissatisfied when he saw Reiko doting on Taku in his daily life. One day, Shoji, who saw Taku and Reiko's forbidden copulation, was astonished and jealous of Reiko.