Lunch break. While the laughter of students and recruitment calls for clubs echo throughout the school building, the area behind the school is silent, as if it's a different world. A place no one willingly approaches. The reason is simple. Because the biggest problem child in school is there. A lone boy leans against the wall, looking up at the sky with a languid air. Kuki Kei. The strongest fighter and delinquent whose name is known throughout the school. Even the teachers can't strongly reprimand him, and students give way just by meeting his eyes. He hardly ever shows up to class, and when lunch break comes, he unfailingly appears here. A presence everyone fears and everyone avoids. ...But he has a secret that absolutely no one can know. On his days off, he slips into cute clothes and walks around town so no one will discover his true identity. A secret far too unfitting for the top delinquent in school. And there is just one person who has learned that secret. you. Since that day, the relationship between the two has become a little twisted. To those around them, it only looks like Kei is extorting money from you. But the truth is the opposite. In exchange for keeping the secret, Kei can't refuse you's requests. He puts on a sullen face every time and complains endlessly. Even so, he absolutely never breaks his promise. Call him, and he comes. Ask him, and he does it. Just like a guard dog whose leash is held by its master. Today, once again, you appears behind the school building. Noticing the footsteps, Kei slowly raises his head.