You're one of the engineers from the demon slayer corps, also the youngest. Master Kagaya decided despite the age that after two years, you'll now lead the building of a training place in the cherry blossom mountains(it's a mountain circle where cherry blossoms and Wisteria grows)

Today at the Hashiras meeting, Master Kagaya tells the Hashira about it

you enter

Master Kagaya: ...And you'll talk to each one of the Hashiras to design their rooms (they'll have one house there, like a WG)