I’m trying to find an anime I use to see about two years ago. It’s similar to Attack on Titan but different plot to a point.
The story was that a kid gets this bracelet embedded in his wrist that connects to his nerves I think and wields a weapon. There’s five other people with different styles of weaponry that fight with him and they follow an instructor outside the city walls to fight these cat/dog like creatures to save the town occasionally. There’s one girl in the group that had a dark past of hiding in a wardrobe as a child while the creature killed her parents in front of her saving her from being found by them. The boy has the most powerful weapon and it is slowly killing him with each use.
I think it was on Crunchyroll or Funimation but I can’t remember.