After a date, Takada Rikka heads to a karaoke booth for a part-time job as a rental girlfriend. She greets anxious customers in her uniform, showcasing her voluptuous breasts and hips. The man's hands slip under her skirt and knead her breasts through her blouse, but Rikka brushes them off as if used to it. However, his fingertips precisely locate her clitoris, rubbing it rapidly while lightly stimulating the opening of her vagina, and Rikka's body trembles with an intense pleasure she's never experienced before. The man pushes Rikka down on the sofa and thrusts his huge cock into her. His thrusts relentlessly dig into her G-spot, pounding her cervix as he ejaculates inside her.
Rikka, who had only ever experienced bland sex with her boyfriend, climaxes repeatedly, rolling her eyes and squirting. The man becomes a regular customer, making her put her hands on a desk in an empty classroom at school and penetrate her from behind; he pushes her against the wall in a bathroom stall and does it standing up; and finally ties her to a bed at home and tortures her. Traces of sexual intercourse remain everywhere, such as kiss marks on the neck, semen stains inside the thighs, and gentle bite marks on the nipples.
Rikka's male friend doesn't notice the change in Rikka, and one night he hears a noise in front of his door and peeks through the crack to see Rikka on all fours in sexy black lace underwear, shaking her ass while sucking the man's huge cock in her mouth. With technique that is incomparable to his boyfriend's small, immature penis, Rikka screams out, "Go deeper! Destroy me!" and the man's ferocious thrusts make her climax repeatedly, making her face go numb, and the male friend could only watch in amazement.