A young boy named Mario is asked by his father, who works at a game company, to become a GM. Although reluctant, after analyzing the game, he realizes that the stimulation he receives in the game can also be experienced in real life, and sets his sights on the quiet girl Takashina Koharu as an experiment. Takashina aspires to be the complete opposite of her real life, a useful and colorful character. However, she is assigned to a prostitute class! After being raped by a rough man, her uterus begins to throb, even though she is still a virgin in real life.