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.

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons. 
Season 1, Episode 13: 
Haruna is given the task to hold a Spring Festival at the local shrine, in her own magical-Equipment-girl way, of course... Seraphim does not want to be a freeloader at Haruna's and Ayumu's place, so she starts cooking... And a concentration-game contest in the school's main assembly hall pushes Ayumu and Orito to their limits... (Source: AniDB) 
Season 2, Episode 0 part 1: 
Haruna wants to play more with Hellscythe at a swimming pool. 
Season 2, Episode 0 part 2: 
Hellscythe's birthday is near! Haruna prepares a birthday party for Hellscythe in her own magical-Equipment-girl-way. What kind of party could Haruna be holding? What kind of birthday presents will Ayumu and gang give to Hellscythe?

Life - or undeath? - isn't easy for Ayumu Aikawa. A seemingly normal high schooler, he is in fact a zombie who serves as a bodyguard to an introverted necromancer. But his already complicated existence becomes even more outlandish when he accidently steals the powers of a magical girl, transforming into one himself - complete with frilly dress and pink chainsaw!! How's a reanimated corpse supposed to keep his head on his shoulders with roommates like these girls around the house?
 (Source: Yen Press)

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