It's been a year since my father, who went on a solo assignment, didn't come back. Yuta knew painfully well that his mother, Natsumi, was acting strong but was actually lonely at heart. He wondered how he, as her son, could comfort his mother... Days passed without finding an answer. At such a time, Yuta witnesses Natsumi indulging in masturbation and sobbing after cumming. Yuta, who witnessed his mother's heartbreaking figure, makes a decision. It was to hold his mother in place of his father.