As an ordinary high school student, Aikawa Ayumu experienced an unexpected demise at the hands of a serial killer, only to be reborn as a zombie thanks to a necromancer by the name of Eucliwood Hellscythe. Devoted to protecting and serving Eu, Ayumu inadvertently strips a magical girl named Haruna of her powers. As a result, Haruna tasks Ayumu with battling against the "Megalo," an organization opposing magical girls.