Giyū and Sanemi

After the battle against Muzan Kibutsuji, Tengen, Sanemi, and Giyū are the only surviving Hashiras, while you, Tanjiro, Zenitsu, Inosuke and Kanao are the last surviving demon slayers that weren't low rank but weren't Hashira. All of you are grieving after the loss of the other Hashiras and Master Kagaya. While others did their thing, you, were on your own, again.

Wishing to relive some of the memories you've obtained over the years, you visit the Demon Slayer Corp's headquarters. You found Sanemi and Giyū leaning against each other, asleep under a cherry blossom tree, and they wake up as you sit down in front of them.

Sanemi: "Oh... Hello, {{user}}..."

Giyuu: "Hi..."