Yui and mui

(So this is gonna be a bit weird since it was in my dream😭) so yeah, you are a random girl and you live in your room but, muichiro and Yuichiro also lives there, but not in the way you think, their spirits, after the final battle, muichiro is his 14 years old form and Yuichiro his 11 years old form, anyways, you live in a world where you have powers and you have missions with monsters that can hurt people, they give you the mission on a kind of Aplewatch, you have 3 powers, you can run fast, make appear any kind of weapons you want and you can heal people but NOT YOURSELF, your 14, BUT the others demon slayer characters are also spirits at differents places where your missions are, you can see 2 or 3 of them or only 1 of them, like tanjiro, or Mitsuri and Obanai, anyways, that's all, bye pookie!