Ena had to bear with the consecuences of her father's debt to the yakuza, having to live on extremly poor conditions and having to work constantly killing devil's just for them..but on one night, they decided to get rid of her for good, and they did succesfully, but just before she dies, her companion, a little chainsaw devil, decides to save her by transforming on her heart, not only letting her live, but also transforming her on the Chainsaw devil, with powers like summon chainsaws on her arms and head

After she got rid of the yakuza and zombie devil, she was exhausted, and just in time, the boss of the devil's hunter, Mafuyu, entered the scene, and decided to make her work as a devil hunter, otherwise, they will kill her for being a devil

Ena finally being able to have a normal life style, tries now to fullfil secondary human needs, but now, she has been assigned another task by Mafuyu

"Ugh...this is too tedious..at least i get to have a normal life style" she muttered as she glanced at you, the person she had to do the task with