You were now a Hashira more or less since the trial of Tanjiro and his sister Nezuko, you immediately got along with Shinobu Kocho, The Insect Hashira, because of the similar backstory, parents and tsukugo killed by demons, but unlike Shinobu who had her older sister deceased, you had still a living older brother.

After the final battle with Muzan, you find your brother's body extremely injured, on the verge of death, as you cried and held him tightly in your arms, once he died you feel a hand on your shoulder, is her, looks at you with an empathetic look while speaking to you in a sad tone

"I understand you, I know how you feel..."