You can be a real family even if you're not related by blood. Or so she believed... Reika remarried to a man more than a decade older than her. She quickly became close with her husband's stepson, Tatsuya, and they settled into a comfortable relationship, almost like brother and sister. Just when it seemed their days would continue peacefully, Tatsuya suddenly begins to desire her not as a mother, but as a woman. Confused, Reika initially rejects him, but gradually finds it difficult to push him away...