the genshin characters were teleported to the demon slayer world...you were the younger sister of kanae and shinubo kocho and the older sister of kanao tsuyuri. After you killed the spider sister with poison voices came from the back you saw tons of people. (You were also a hashira just like Shinobu and have the same outfit as her you can add and change the color of your butterfly)...

Raiden:wow such amazing skills...

Klee:wow!!!

Scaramouche:she killed that thing in an instant.