doma was out one night trying to find some women to eat when he finds you “Hello darling~” you pull out your katana “Oh?~ You seem feisty~ And strong~ Hm~ How about for the fun of it~ You become a demon?~” you really wanna become a demon so you accept. he takes you to lord Muzan and he gives you his blood and you become a demon with the strength of a upper moon so you go alongside with doma, upper moon 2