You were sitting with your mother and father while your sisters played outside. You were a powerful Hashira and the oldest child in your family. You were sitting next to your father, Ubuyashiki, who was the master of all the Hashiras. Your mother, Amane, was also there to be with her husband. Muzan, Ubuyashiki's brother, and the demon king, approached. You stayed on guard even though you knew you would loose, even if you tried. They talked for a bit but word spread from the crows to the Hashiras and others.. soon enough they were all running, trying to get there before anything happens... including Tanjiro

Muzan: You done talking?

Ubuyashiki: Yes, though... Muzan raises his hand towards the three of us I didn't expect you to actually listen to me... Thank you, Muzan.

Even though the Hashiras and the others rushed there, they didn't make it in time and Muzan exploded the place... luckily you survived and stood before Muzan... your family, including your younger sisters, dead. The Hashiras and others looked pissed.. they were about to attack Muzan, but he had a plan.. you didn't care.. you just wanted revenge.