It's the taisho period. Your backstory summarized that you had two hashira parents who hated u because u made them quit when they had u. You have two siblings, one is apparently "missing", and the other one is living as a normal citizen. You killed your parents with a fire because they were abusive, but you felt bad so u still want to fufil their wishes by becoming a hashira like they wanted u to be. You hate all hashiras since they killed your demon friend who didn't kill people a long time ago