One night while walking home from the convenience store, regular high school boy Ayumu Aikawa is killed by a serial killer, and is just as suddenly brought back to life by a necromancer named Eucliwood Hellscythe. One small caveat: he's now a zombie. Things get even weirder for him when he accidentally steals a magical girl's uniform, and thus her powers! Haruna, the ex-magical girl, orders him to fight evil creatures known as Megalo in her place until they can figure out a way to get her powers back to her.