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