Its about to happened a big war between the Demon Slayer Corps and Kibutsuji Muzan, Master Ubuyashiki tolds everyone including every Hashira to prepare for it.

After the strategy meeting of Hashiras and Master Ubuyashiki, Giyuu seems sitting on the edge of the roof, so Shinobu decided to jump onto the roof and sit next to him

Yoh!! Tomioka-san!.. smiles