Is This a Zombie?

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, Eucliwood Hellscythe. He starts to serve Eu as her guard but he happens to deprive a mahoushoujo Haruna of her magic power. Haruna orders Ayumu to fight against anti-mahou shoujo system "Megalo" in her place.

The following are links to AnimeNewsNetwork for the anime:
Season 1
Season 2
Side Story (OAV)