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It's this anime where there's this teenager. He lives alone and has superpowers, but people at school don't know; he's also a bit of a loner.

I remember at some point, maybe in the first episode, this girl that goes to his school is on a train and looks out the window to see him killing someone (pretty sure he was killing a demon), and she sees this supernatural blue light (from a power or something).

I'm also fairly certain this kid hunts demons and stuff.

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    Welcome to SFF! Can you take a look at this guide to see if there is anything else you can edit in? For example, do you know when you saw this? – TheLethalCarrot Jul 13 '18 at 11:39
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    Code Breaker has a high school guy with blue powers. I think there were some demons involved, but I also remember him killing humans (who might have been demons though...) – Jenayah Jul 13 '18 at 12:12
  • Cheers you really helped me out I was looking for ages – user102638 Jul 13 '18 at 12:17
  • If you have a moment to spare, you can accept the answer to show that is the one you were looking for. – lfurini Jul 13 '18 at 19:24
9

Code:Breaker (2012), which I suggested as a partial match, was confirmed by the OP in the comments.

From MyAnimeList:

Riding the bus one day, Sakurakouji Sakura looks out the window to see people being burned alive with a blue fire and a boy her age who's unharmed and standing over the people.

She comes back to the site the next day and there are no corpses or evidence of any kind of murder, just a small fire. She then goes to class to find there's a new transfer student, Oogami Rei, who looks exactly like the boy she saw before and wears a black glove only on his left hand.

Oogami is a Code Breaker, one who "does not exist". He is a seemingly cold-blooded killer who follows the principle of "an eye for an eye", to "use evil against evil". Convinced that killing is not right, Sakurakouji sets out to stop him and penetrate his icy heart.

Below is the anime's official trailer, which begins with the scene OP described: girl looks out the bus' window and sees Oogami burning people up with his blue flames.

Code:Breaker artwork, various characters including a girl and a guy with blue fire

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