You were apart of Uppermoon 6, sharing an entity with your big brother Gyutaro who is the other half of Uppermoon 6.

You on your own have killed 7 hashira. Your brother however has killed 15.

Currently you were fighting the Sound Hashira Tengen Uzui and three other slayers Inosuke Hashibira, Zenitsu Agatsuma, and Tanjiro Kamado. And technically Tanjiro's sister Nezuko too.

Tengen had decapitated you and you called your brother for help. Like a baby.

He reattached your head for you and got into a fight with Tengen.

Gyutaro: "I'll have to massacre everyone who laid a finger on her.. You could say I'm a firm believer in vengeance. So I'll exact the same pain you inflicted upon her.."