Girls these days just love to have fun! Kyoka, an energetic high school girl with a reputation as a slut, parties so hard she constantly struggles to pay her monthly mobile phone bill. Desperate for cash, she launches a side hustle: deflowering virgin boys from her school at bargain-bin prices. When members of the "brothel" group—including Erina and Leona Hojo—are sidelined by a cold, they ask Kyoka, the only one still healthy, to handle the next job. They explain that she can't service the client—the scion of a major corporation—alone; she needs a partner to help with the care. After some thought, Kyoka reaches out to her best friend, Karin, but Karin is a dedicated student who flatly refuses to listen. However, after Kyoka tearfully begs her—promising it will be "just this once"—Karin finally agrees to join in...