Rui starts part-time caregiving at a nursing home. Despite experiencing sexual harassment, she continues her daily work. However, an elderly researcher who was once a university professor sets his sights on her, using his homemade mind control device to remove her resistance to anal stimulation and implant it as an erogenous zone. The brainwashing deepens, and eventually, she becomes a caregiver specializing in licking old men's shitholes. The brainwashing keyword is 'ガバマンクソ穴2穴メス'.
