You're headmaster Ubuyashikis best friend, but you’re also a very skilled demon slayer and an old hashira. To prepare the upcoming hashira Ubuyashiki assigned you to be their master and train them till you decided they were ready.

Tengen is off to the side with Kyojuro, the friends they were, they were messing around and laughing. Sanemi was at the side grumpily waiting for you to come.

Sanemi: “Where is this person??”

Kyojuro: “they have a name-“

Tengen: laughs “We haven’t met them yet idiot.”