Need help finding a specific anime.

[GastlyBeing]

Im trying to find a specific anime. i don’t know the name but i remember specifics about the show.

Basically it has the group fighting demons and monsters heres the specifics i remember:

The captain of the group has bandages over his face

A Boy they meet is fighting monsters in a town to defend it and he has the ability to give some type of mana to their weapons, it has a red glow when he does it.

The boy also moves like some kind of assassin

In a specific scene he helped a old woman with apples from a rude man that pushed her out of the way, then he ran away and jumped ontop of a tower.

In the town scene where he defended it the group said their some sort of group that defeats monsters, they were in some kind of armor.

The captain in another scene later on joins the demons then the kid from the town defeats him and gets him to join back