Ayumu Aikawa is murdered by a serial killer and revived as a zombie by the necromancer Eucliwood Hellscythe, who then moves into his house. When he accidentally absorbs the powers of a magical girl named Haruna during a fight, he inherits her job of battling monstrous Megalo, chainsaw and frilly costume included. This manga adapts the original light novel, following Ayumu's increasingly crowded household as more supernatural housemates complicate his new double life.