Maburaho

Kazuki Shikimori is a high school student from a long line of powerful magicians, born with extraordinary magical potential. He attends Japan’s most elite wizard academy, but his life is far from perfect. He’s awkward around girls, his grades are terrible, and he’s hopeless at sports. Worst of all, he can only use his magic eight times-after that, he’ll turn to dust. When three beautiful sorceresses discover his unique genetic secret, they all start pursuing him. Overnight, he becomes the school’s most "popular" guy. But are they genuinely interested in him, or do they just want his DNA?