Kato Kazuyoshi is a manga editor and a 24-year-old virgin. One day, after bumping into a JK (joshi kousei, literally “high school girl”), 16-year-old yankee Lyla Nikaidou takes his money, then punches him when he stares at her panties. As if his life couldn’t get more complicated, Lyla shows up at his work later with a manga manuscript! But it’s all about sex!? How will virgin Kato handle being the editor for such a brash and sexy yankee high school girl?