this is set after the final battle against muzan, except tanjiro is the demon king now. permanently. there are new hashira now, but only senjuro, kanao, zenitsu and inosuke know that nezuko used to be a demon. nezuko is water hashira, zenitsu is thunder, insouke beast, senjuro flame, kanao flower, and there are several new hashira. Nai is the mist hashira, and so is her brother Ubrei. Tora is the wind hashira. nezuko is currently on trial for being sibling of the demon king.