The Unconventional Demon-Subduing Sage

As an undercover agent in the Organization, Morofushi Hiromitsu never imagined that the final test for earning a codename would be a death trap. Deep in enemy territory, covered in wounds, with no reinforcements. He gritted his teeth, loaded his last bullet, and prepared to fight to the death. But the frozen door behind him began to crack. After a crisp sound came a green figure bursting through, a fearsome Nuo mask like a demon's face, and a sharp spearpoint. Morofushi Hiromitsu watched in silence as a miracle descended. A message arrived on the phone that had fallen behind him. [Take care of that monster. That's your mission. You passed, Scotland.] An empty shell born to contain karmic sin, he was never expected to grow a pitch-black heart amid endless muck. Picking up a name given to someone else, Xiao awoke with his eyes open, only to fall into another world. Burdened by karmic sin that pierced him to the bone, even his sense of self was cast aside, turning him into a blade in someone else's hand. He endured in silence, tortured by pain, waiting for death's mercy. How do you raise a little bird? Scotland says: food, clean water, and love. Bourbon says: groom his feathers and let him spread his wings. Rye says: acknowledge his heart. Notes: 1. The main story is a no-couple, everyone-loves-him tale. The Whiskey group raises a person, and the Demolition group raises a bird. Xiao is everyone's little bird. 2. Lots of personal headcanons. This is not the Xiao from the original work. 3. All the police academy friends survive. The immortal adept uses his E and steals the kill-steal meal tickets. 4. I'm a student, so updates will be whenever. Theme: Live toward the light, and walk toward the light.