Yuto, a son who doesn't like his mother Yuka's remarriage. This is because he, who has lived with his mother and child for a long time, sees her as more than a relative. However, when Yuuto witnesses Yuka's relationship with his new father, he becomes overwhelmed with jealousy. Yuka is heartbroken by the appearance of her son who is hungry for love, and gently guides him to become an adult man as a mother and a woman. Even though they know that their relationship is unforgivable, the two are drowning in lust that transcends the feelings of their immediate family...