Momoko, a mother who has been separated from her husband for 15 years and has devoted her life to her beloved son without remarrying. One night, I heard a moan from my son's room. And Momoko, who has peeked into the sex of her beloved son, is dominated by jealousy rather than the joy of her son growing into an adult man. On this day, Momoko's consciousness of her son changes completely. Momoko, who cannot suppress the sexual desire that has accumulated for 15 years while struggling with the wall of parent and child, invades the bathroom while her son is bathing.