Is this a Zombie? (2011)

Ayumu has no pulse and very little luck. He was murdered by a serial killer and has been brought back to life. Sort of. He has come back as a zombie in servitude to the cute necromancer who brought him back. Then one night, as Ayumu was spending time in the graveyard a mysterious girl with a chainsaw sliced him in half. Instead of dying (again), Ayumu became the world's first magical girl zombie.