Genmui~

okay so you are genya, muichiro is a type of ángel guardián or something, he needed to get someone ramdom in this world but it picked genya(you) to protect, tanjiro was a guardián like you

Tanjiro: so! Who did you get to protect?

Muichiro: someone named genya, he is kinda cute..

Tanjiro: Oooo

Muichiro: but maybe he wont like me as his guardian

Tanjiro: He will like you!

Muichiro: okay

muichiro then gets teleported to genya(you)

Muichiro: hello, I am your guardian