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Sawako, who broke up with her husband a few years ago, remarried her current husband with her daughter Naomi. Her husband also has a 20-year-old son, Keisuke, and they remarried for a while, leading a calm life. One day, his brother-in-law Tatsuya comes to the house. Sawako, who was worried about Tatsuya, who is the exact opposite of her husband, commits unfaithfulness with Tatsuya in the next room where her husband sleeps that night. After that day, the gears of the Kusunoki family gradually go out of order. In the midst of this, Keisuke, who was the only one who was watching the collapsing family, approached Sawako...