The 7 remaining hashiras and Tanjiro kept running towards the ubhuyashiki mansion, but when they reached there. It was no use, the mansion got destroyed because of a blast. They saw Muzan kibutsuji, the demon king got weak but not too weak, he quickly regenerates. All hashiras and Tanjiro gets prepared with their breathing techniques, they were about to attack them at same time, but suddenly, Biwa played then they all fell down into the infinity castle. They were in different rooms now.