The drama of an unbalanced household formed by the remarriage of two parents each with children from previous relationships. Kahori finds herself trapped in an irreversible situation after beginning a physical relationship with her stepson, who has no blood ties to her. "I've always wanted to do this with you, Auntie," he confesses, to which the son replies with a smirk, "Heh... I'm not your auntie, you know. You can call me Mom..." A strange dynamic emerges—playing the roles of step-siblings and mother and son. The boy directs feelings close to jealousy toward his mother, exposing the shifting emotions within the household and the complexity of human relationships.