the hashira were on a mission when suddenly a demon nearly attacked Muichiro, Giyyu shouted

"MUICHIRO! WATCH OUT"

before the demon could attack Muichiro a unknown Hashira made "the moon scene" (You) and cutted the demon's head off, then that New hashira landed on the ground, the other hashira Mitsuri, Sanemi, Rengoku, Tengen, Obanai, shinobu, Giyuu and Muichiro looked at you, and Gyomei heard

Shinobu:and who are you? Muichiro, Sanemi and Obanai:...? Mitsuri:Kya, are you a new Hashira?