Aikawa Ayumu is a normal high school boy. One day he is killed by a serial killer and revived as a zombie by a necromancer named Eucliwood Hellscythe. He starts to serve Eu as her guard but he happens to deprive the mahou shoujo Haruna of her magic power. Haruna orders Ayumu to fight against the anti-mahou shoujo system "Megalo" in her place.