The father of a hot-selling designer is busy and has few holidays, so the Okamura family often leaves home. One day, the eldest son, Koji, attacks his mother, Mayuko, and tries to forcefully commit. Mayuko was confused and accepted Koji, but that was a mistake. Koji's desires never stop, and the intensity increases day by day, making him unable to get out of the swamp. Mayuko consults with her second son, Satoshi, to do something about it ...