Yuina, a popular cosplayer known for her huge breasts, is scouted in Ikebukuro—the holy land of cosplay—and enters the entertainment industry. However, she gets caught up in a scam orchestrated by shady talent agents. Convinced by the scout, she signs a contract to become a trainee at a talent school, only to be told afterward that the program requires a 1 million yen fee. Unable to pay such a large sum, Yuina requests to cancel the contract, but because she's already signed, she's denied—and ultimately pressured into performing sexual acts. Later, a skilled manager is introduced to her, and Yuina makes her debut as a busty idol under the stage name "Super Chichiko."