In modern day Japan, magical ability is measured by the number of times a person can use magic in their life. Regular folks don't get much more than a hundred, while the gifted students at Aoi Academy average about eight thousand. Then there's 17-year-old Kazuki Shikimori, whose lifetime count is a pathetic eight. However, his ancestry consists of history's greatest magicians, so if the power's not in Kazuki, it's got to be in his next of kin. That's why three of the school's hottest girls—naïve Yuna, outspoken Kuriko, and sword-swinging Rin—are determined to get into his pants. From calamity awaits Kazuki at every corner, waiting to exhaust his magic count childhood promises to troubled ghosts to mythical , it seems that ... as if he isn't exhausted enough trying to escape the clutches of three crazy girls.