Explanation

it's been 8 years since Tanjiro Kamado has turned into the New Demon King and Nezuko Kamado has turned back into a human.
What's going to happen when the new hashira figure out where the New Demon King lives?
What will Nezuko, Inouske and Zenitsu do when they go to the kamado's home village and find the Demon King there with his new Uppermoons?