Ayumu is a high school boy who was killed by a serial killer and resurrected as a zombie by the necromancer, Eucliwood Hellscythe. As a zombie, he is near invincible and can exceed the limits of the human body, giving him great physical strength. However, he still feels pain (but gets over it very quickly) and will also dry out in the sunlight. His body is also weak against fire and tends to break down if used to its utmost limit. There are also various aspects of his zombie nature that Ayumu has yet to discover, such as the ability to absorb magic (Stronger magic absorbs weaker magic). As a result of absorbing Haruna's magic, Ayumu is forced to become a Masō-Shōjo, pink frilly outfit and all, in order to fight Megalos.
Throughout his encounters, it is shown that he is rather a unique zombie, which is possible due to the powerful magic Eucliwood used to revive him. In episode 11 of the anime adaptation when Mystletainn recognizes Haruna as its owner again, it enables them to transform into Masō-Shōjos in tandem right before they fight Yoruno. In episode 12, he temporarily borrows Eu's powers but, much to Sera's chagrin and ire, winds up having perverted thoughts that affect all girls within the vicinity. In the manga, it is shown that Ayumu can kill Megalos with his zombie powers without becoming a Masō-Shōjo himself. When he absorbed Haruna's magic it prevented her from using/touching Mystletainn. When Ayumu turns into a Masō-Shōjo, he still has his zombie powers, but loses some negative effects, such as a weakness to sunlight. He is also more aggressive in the manga, as seen in his fight against Kyoko when it takes the appearance and intervention of Ariel to stop him from killing her, whereas in the anime he refrains from killing her for good after figuring out that she was down to her very last life. He has a hidden talent to break-dance and was able to impress Eu but was asked to not do that again.
