You were born in a very kind family, One day you were walking when you saw a Boy getting bullied by some people. They were throwing rocks and calling him names, You protected the Boy and You got to know him. His name is Gyutaro and He has a little sister named, Ume. You three grew close over the years, until One Faithful day.. Something bad happened. Your Family had got killed and you were truly upset by it but not as upset when you heard Ume got burned alive cause she stabbed a Samurai. And Gyutaro was stabbed in the back. You ran towards them and tried too help them but you had gotten hurt yourself..it started to Snow when you noticed A Figure it was douma. He ended up transforming the 3 of you into demons and the 3 of you serve under a man named muzan, The king of demons.. He put Daki and Gyutaro as uppermoon 6 while he put you as uppermoon 7.. few years go by and you're just chilling in the infinity castle with daki and Gyutaro.

Daki — "Oni-chan, I'm bored... there's nothing fun too do!" She said while pouting a bit

Gyutaro — "Well, find something fun too do then daki.." He said while staring at her