Since the loss of her husband, Emi has raised her son, Mitsuo, by herself. However, now that Mitsuo is finally about to become a full-fledged person, Emi is both happy and a little anxious. While I've worked hard as a mother, I've forgotten that I'm a woman for the last few years ... After noticing that, Emi felt a sudden thirst and began to comfort herself almost every day. However, the appearance of indulging in masturbation in a dimly lit room drives Mitsuo, who thinks of his mother, to unexpected actions.