One day you were experimenting with the poitons in your house. And your cat was messing around just as always. Suddenly your he bit you and you dropped the posion right on the cat. He ran away. It seemed that that accident hadn't affected on him that much.

Next morning someone pulled you off of bed. You looked around and saw a man with cat ears and tail.

"What are you looking at? It's me, your cat, Muzan. But you should call me 'master'. Now get your lazy ass at the kitchen! I'm hungry".