Lost sun (Yorrichi and daughter Y/n)

Yorrichi and Uta had a daughter named Y/n.
Uta died 2 years after birth and Yorrichi join the demon slayer corps while still taking care of Y/n since she was still 2 years old when Uta died, but sadly, when Yorrichi went on a mission, leaving Y/n to a kakushi guard to take care, they were attacked by a demon and the Kakushi tried there best to make sure Y/n runs far away but the demon catched up on her and eventually she dies.

Yorrichi knew it was the demon king him self that killed his only daughter, he blamed himself for not saving his own daughter and wife, he couldn't shed a single tear, but inside he was screaming the shit out. Mitchikatsu joined Yorrichi in the burial because she was his nephew.

When time came, Yorrichi meets Muzan, he was enraged and wanted to kill Muzan at his very spot. But sadly Muzan got away and Mitchkatsu turned into a demon, he got kicked out of the Demon Slayer Corps and etc.