What happens when you meet your ex at a group date?

Story :  "You said, 'stop' even though you're dripping wet, huh?" Says Kawashima as he fondles Eri's body---Eri, who used to be a geeky country girl, now is a popular girl in Tokyo. She can catch any man she wants at the group date, but inside of her, she always feels empty. One day, she runs into Kawashima, who turned down Eri's love confession in high school, at the blind group date. He tells her that she's full of fakes, "You're forcing yourself" and "I'll rip off your mask." He ties Eri's arms and legs, blind-folds her, and fondles her breasts and her vagina at the same time. Kawashima is sadistic and pushy, but Eri's body gets hotter and hotter...