My husband works alone and is away from home for a long time, leaving my father-in-law behind. Yoko begins to feel lonely, and tries to relieve herself by masturbating, but her father-in-law sees her doing so. The next day, her father-in-law attacks Yoko out of pity. Yoko hated it and refused it, but her body was enveloped in a strange feeling of being satisfied. And she gradually begins to seek out her unparalleled father-in-law...