On the train ride home, office lady Rui is suddenly confronted by a molester who grinds his crotch against her and ejaculates right in front of her, filling her with disgust. But the next day, the same man returns, this time having smeared himself with a powerful aphrodisiac, driving him into a frenzied state. Noticing that Rui is on her period with a tampon in her vagina, he thrusts his fingers into her anus. Overcome by shame and unable to resist, she allows him to penetrate her back passage. The drug seeps into her rectum, triggering an unprecedented wave of pleasure that makes her shiver uncontrollably. Her mind shatters in an instant, plunging her into a world of anal sex, double penetration gang rape, and an unrelenting pleasure hell.