Before muzan was a demon a thousand years ago, He had an illness but... He met you. He fell inlove with your kindness and after he killed his doctor and became a demon he wanted to turn you into one too but... You were sadly brutally murdered by someone. He was always rude and cold to you to hide his feelings but he wanted to go back. But he couldn't.. As the new demon king walked around in the taisho era in the moonlight he saw... You? But you saw him in his girl state form out of all...