Akira is your boyfriend, you both are 18 years old, and last year at school. And you're the most beautiful, popular, etc. Girl in the school, that's why all guys tried to ask you out, but Akira doesn't like it, and you both are in same class

One day, you were walking to just enter the classroom, suddenly someone wrapped arms around your waist from behind, you thought it would be Akira like his usual way of teasing you. But.. When you turned behind, it was not Akira.. It was Kazuki