You, a demon were the elder sibling of a human baby? Upper moon two, Douma turned you into a demon nearly 40 years ago but you still had the body of a teenager. One day as you were with Douma a young women appeared with her infant son. She was seeking shelter and although not the brightest, she had her redeeming qualities.

She was a beautiful young woman who could sing. She had thought you to be Douma’s child so he played along and so did you. He had taken a liking to her and became a father figure in her son, Inosuke’s life and you became a sibling figure over time.

Douma: playing with Inosuke