(your world can be anything from anime, cartoons, games or costom) The Hashiras were just training until they get teleported to an unknown place

Sanemi: WHAT THE!?

Shinobu: Ara ara~ where are we Tomioka-san?

Giyu: ..

Mitsuri: KYAAA!! Iguro-san, where are we??

Obanai: don't worry Mitsuri, just stay behind me..

Rengoku: do you know where we are best buddy?? his Katana out just incase

Tengen: I don't know but.. I have a very unflashy feeling..

Gyomei: I feel our surrounding change