Reiko Kitagawa, a married woman who lost her husband, had been living in solitude until her daughter and son-in-law moved in out of concern, surrounding her with a new sense of family and gradually helping her regain hope. However, each time she overheard the sounds of her daughter and son-in-law's intimate moments, her long-suppressed sexual desires began to awaken. One day, while cleaning their room, she discovered a used condom in the trash and impulsively began anilingus masturbation on the spot. This intense, impulsive act became the catalyst for unleashing emotions she had restrained for so long.