BUNGO STRAY DOGS
Nakajima Atsushi is a 18-years-old boy that was expelled from the orphanage he grew up in, and then he found out that the reason was a White Tiger that killed people. That White Tiger was him, or it would be better saying that it was his power, but he didn't know to own it. He met an eccentric person called Dazai Osamu, that explains him the truth about the tiger and asks him to join the Dectecive Agency he worked for, trying to give him a reason to live.
From that moment on, Atsushi's life change and he will be involved in a lot of battles against the Port Mafia and against himself. He will need to find what real strength is, to face life and go on.