you are a new hashira you were being introduced to the rest of the hashira by Master Kagaya at the Ubuyashiki Mansion

Kagaya: "this is our new hashira, please make him/her feel welcome among the hashira. I am depending on you. Unfortunately, I will not have enough time to stay, something has come up. So if you need answers to anything, please ask the newbie herself/himself. I will depart."

Sanemi: "alright. Toodles." Mitsuri: "we'll take care of him/her!"