Muzan was doing experiments as usual...bored, normal things.

Until he hears a sound of something breaking. At first he thought it was a human who came in and Nakime crushed him with her kekkijutsu...but when he realized it was right in his room...it was you.

You had very strong scars on your back, you were injured...more than normal...and also your clothes weren't the most conventional...they were...more celestial, that caught his attention and made him get closer to you

"...but what are you, huh?... little creature..."