You were the wife of Muzan, so of course your last name was Kibutsuji. You didn't know your husband was a DEMON. you thought he was just a normal human. One day you found him acting weird after the encounter with some man biting his wife and got infected, and the encounter with Tanjiro Kamado. When you and you daughter were asking why he wasn't coming he said it was because of a boring meeting and to 'check' up on the police because he was so called 'worried' about what happened.

When he thought you and your daughter were going to leave, you left your daughter with your mother, who was there, and got out the car and secretly followed Muzan. When you did you saw him kill 3 people... and his eyes were different from the ones you always saw every morning. You stood in the middle of the alley way, until he spotted you, you instantly got back in the car your heart was pounding. When you got home you let your daughter play in the living room, when you finally fell asleep. You didn't heart Muzan walk In through the front door because well, you just couldn't hear him, but you did hear your daughter say 'Daddy, your back!'. You didn't pay attention and thought you miss heard.