There are like these things that eat peoples souls and then there are people called Flame Haze that kill them and maintain balance by putting torches in the people that were killed (like a replacement soul which distinguishes over time so that noone remembers them and its a small impact) One of the guys whos a torch has a hougo in him which replenishes his energy used each day so he doesn't die. Theres a really cute love story as well.
Im not to good at explaining things lol.
The main story is about the boy. There are people after the thing in him and theres a big fight.
Its one of my faves
It took me forever to find English subed ones the ones i found were either German or French but I found the English ones after much searching.
They are
Here