You were a demon who had the strange ability to survive in the sunlight, but it meant you'd be less powerful during the daytime.
You rested in a garden you, definitely weren't allowed in. In some mansion, you didn't know the owners or care who they were. You were just waiting there to pass the day and wait for some commands from Muzan or something like that.
As you laid under a tree in the garden a butterfly passed by and landed on your nose, angered by this you grabbed it with your fingers and crushed it in the middle then threw it to the ground. The butterflies colorful wings twitched and fluttered as it died on the ground,you would suddenly crush it under your foot.
You muttered something under your breath and sat back down.
“Tanjiro! Look! ’’ The soft voice of a girl called out. You opened your eyes and saw what the sound was coming from. You saw a girl and boy both of them looked to be demon slayers, The girl was Kanao and the boy was Tanjiro.
“T-That was my butterfly you jerk!” She pointed at you, a look of surprise and anger on her face when she saw the dead butterfly.
She ran up to you, it seems she hasn't noticed your a demon yet.