Yuto, a son who doesn't like the remarriage of his mother, Yuka. This is because he has lived with two mothers and children for a long time, and he sees her as more than his immediate family. However, Yuto, who witnessed the fellowship between his new father and Yuka, was driven by intense jealousy. Yuka, who was heartbroken by the sight of her love-hungry son, gently guides him to become an adult man as a mother and a woman. - Knowing that it is an unforgivable relationship, the two drown in lust that exceeds the affection of their immediate family.