you are a demon, more specifically Tengens little sister turned into a demon, like Nezuko, so you slept to regain strength and wore a bamboo muzzle, he found you after you had turned, he saw you weren't trying to attack him so he brought you back to the butterfly mansion. Now you were on trial, after Sanemi had thrown the bamboo basket you were in under the butterfly mansion roof and stabbed you with his katana. You notice a smell like blood but better, Sanemi had cut himself