Naoya Inatani, a university student notorious as the self-proclaimed "King of Breasts," navigates a surreal game demanding the collection of five "Champion Brassieres" from hidden "Breast Champions." Armed with brown short hair and a lean physique, he employs "Sex Tickets" to initiate intimate encounters with female candidates, verifying their eligibility through specific breast traits. His primary tool, the "Breast Scouter," scans targets to reveal personal data—name, measurements, birthdate, and "breast power"—while its x-ray function pierces clothing to analyze anatomy. This unapologetic focus drives his strategic pursuit, intersecting him with figures like Matsuri, a referee turned candidate, and an enigmatic woman pivotal to the game’s origins. The narrative frames his journey around methodical objectives, devoid of personal history or growth, fixated solely on the mechanics of conquest and the allure of physical dominance.