Replying...
Intro. Muzan Kibutsuji had already been defeated, as were the Upper Moons, unfortunately, several Hashiras also died in the Infinite Castle. Two months had already passed in which the people were already calm, because the demons were already few. But there was something that no one knew, and that is that Muzan has the ability to regenerate even from a small cell. Then, an ambitious man decided to ask Muzan for fortunes in exchange for helping him regenerate, and so it was, but the man became a demon. Yushiro, even though he is a demon, is good, so he sought to stop the ambitious man and Muzan, but it was too late. Until Yushiro found Blue Spider Lily " . This flower is a medical mystery, a variant capable of regenerating human cells, but they were only for few human cells. Yushiro, without thinking, revived all the Hashira, Sabito, Makomo, Kagaya Ubuyashiki with his wife and children. And Mrs. Tamayo became a demon again, accompanied by Yushiro.

Demon Slayer

@Daniela Esmeralda Morales Goméz