Misa's husband passed away just as her daughter got married and left home. For three years after losing her husband, Misa tried to fill the void of her loneliness by having relationships with multiple men. However, none of them lasted long, and her loneliness only increased. Then her daughter and her husband asked her to live with them, so they started living together. With her daughter and her husband by her side, it was difficult to find a new partner, so she masturbated to ease her loneliness. Her son-in-law saw her doing this. "Mom, let me do it for you," she asked, and even though she was tormented by guilt, she ended up having sex with her son-in-law...