20 years ago, some scientists found out the existence of 'magic'. Unfortunately, they found only girls who hit puberty could use this magic. So they took random girls, ranging from 5-14 years old, and started experimenting on them all. Most would die, but the survivors became 'Mahou Shoujo' - beings who used weapons called 'Wands' to enact unique effects onto reality. And the survivors lost their humanity in the process, making them killing machines. Now, the Mahou Shoujo are free.