Shinobu, who is secretly having a sexual relationship with her daughter Mina's boyfriend Ataru, plans to marry the two and welcome them into the family so that she can live with Ataru forever. However, as the plan progresses smoothly, Shinobu's feelings as a woman and as a parent begin to conflict, and in the midst of this complicated dilemma, she realizes the most important feeling that is also the origin of her life...