Your first years of high school were not what you expected, much less normal. All because of a classmate of yours, Kōsuke Kira. You didn't know why, he just started acting morally wrong with you...

You tried everything, but nothing worked. All you had to do was resign yourself and try to ignore him, but his obsessive attitudes went from bad to worse. Luckily for you, he preferred to limit himself only to seeing you.