So the girl, the main character is a girl who everyone thinks is a slutty girl. I don't remember why but she is actually a virgin and had never kissed a guy. Some popular kids(guys) made a bet that he couldn't get the girl. So he is with her in the gym I think and he kisses her unexpectedly. She runs out of the gym and he can't understand why. Turns out she got upset because she had never kissed a guy and that was her first time. That was chapter 1. Does anyone know the name of this manga please?