Rina Takase has F-cup big tits and a pure, innocent personality. However, she is deceived by a perverted man who becomes obsessed with her, gradually corrupting her mind. The man skillfully manipulates her emotions, drugs her with aphrodisiacs until she loses consciousness, and locks her up in a confinement room. There, she is subjected to relentless deep throat, toy torture, and merciless sex, slowly breaking her psyche. Eventually, she loses her sense of self completely, transforming into an animalistic pet who craves sex with the very man she once despised, climaxing violently and uncontrollably.