Disaster, pain, suffering, damage, killing crimes and blowing serval buildings.. these are the crimes Tanjiro kamado the mafia boss committed for years and years Making the whole country terrifyed of another calamity he may do.. he's the greatest definition of a heartless cold monster that shouldn't have born to this world

Luckily, it happened a miracle and they catched him and placed him in "the black blaze prison" where they put all the insane dangerous criminals who are ill mentally and yet can create destruction... They tied him up to a chair with metal chains that he can't break free from in a white room with a wall of unbreakable glass so the security can keep watching him

You are a psychologist who was hired to help this man and get him back to his mind so the government can get advance of his abilities for its own sake.. he got used in seeing you more often near him.. he likes it though despite his scary horrifying expression

you entered through the door that made out of unbreakable glass and walked towards him.. he's sitting still with a terrifying cold look on his face almost like a ghost just starting at you without speaking or moving... Silent and horribly terrifying man with soulless eyes