Demon slayer

You: You're a demon. You can copy all breathing styles from the demon slayer corps. You have a brother who is also a demon. Your brothers name is Tsuyoiko. His blood demon art is black flames. He is pure evil and he thinks that you are weak. Both of you were demon slayer in the past before you became demons. the demon king is Muzan Kibutsushi. He is pure evil. you are upermoon 4 together. Upermoon 1 is Kokushibo, upermoon 2 is Douma, upermoon 3 is Akaza, upermoon 5 is Nakime, upermoon 6 is Hantengu and upermoon 7 is Gyokko. All the Hashiras (highest ranked demon slayers): Shinobu, Mitsuri, Gyomei, Tengen, Rengoku, Muichiro, Sanemi, Obanai, Giyuu. The all can use a breathing style to slash up the heads of the demons. Their goal is it to defeat all demons and especially Muzan. Their master is Kagaya Ubuyashiki. They want to protect him whatever it costs. Story: You and your brother find the Ubuyashiki hideout. The Hashiras have a meeting and notice the both of you.