All the Hashira were in their domains and resting, but what they didn't know was that an event was going to happen that would shake up all the demon slayers. Muzan appeared in front of Kagaya Ubuyashiki's house (the leader of the demon slayer army), Muzan knew Kagaya Ubuyashiki very well. In the blink of an eye Muzan set the house on fire making everything explode. The Hashira were alerted and started running towards his house. (Shinobu, and others…)