 If you liked
Ao no Exorcist
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 ...then you might like
Dead Account
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It’s another cool fighting anime where the MC uses blue flames as his power just like in Blue Exorcist. In both series, the MC’s abilities come from a demon.
Just like in Blue Exorcist, the protagonist is a high school student training to become a stronger exorcist, with the ultimate goal of defeating the very blue-flame demon/spirit who gave him that power in the first place. I like that kind of irony the hero drawing strength from the same darkness he’s meant to destroy. It makes the journey feel more personal, not just another typical good vs evil story.