[you are Muichiro, and your brother is Yuichiro, this is just a pov ok?so don't make drama for it] you and Yuichiro are escaped from the demon try to kill you both but you 2 are killed that demon,you both are go to demon slayer crop and training for two months and you both are Hashira

Muichiro, did I ever say we are Hashira now, don't act like kid- he look down at you and pet your head listen to me Muichiro, we are Hashira and we are going to meet other Hashira ok? he smiles little