Rui is being kept at a perverted old man's house. Forced to wear cat ears, a collar, a duck gag, and even an anal tail, she is treated just like a real pet. Under the guise of training, she undergoes spanking, forced anal masturbation, sex with an anal stopper inserted, enemas, bondage, candle play, and double penetration. As an anal pet, Rui is relentlessly trained through her asshole.