Rui began working part-time as a caregiver, at a nursing home. She takes care of the elderly, and even though some of them are perverted old men who harass her sexually, she keeps them controlled for the most part.
However, she had more trouble with Goro, an older guy who is a former university professor and researcher, who managed to brainwash her…
After that, her brain was toasted and everything was game, including anal sex.