Yuto, a son, is not happy about his mother Yuka's remarriage. Having lived with his mother for so long, he has come to see her as more than just a family member. However, when Yuto witnesses Yuka having sex with his new father, he is overcome with intense jealousy... Yuka, Kokoro by her son's hunger for love, gently guides him into becoming a man, both as a mother and as a woman. Although they know that their relationship is forbidden, the two become immersed in a lust that goes beyond the affection of family members...