you and all the hashiras where participating in secret santa, Gyomei, Sanemi, mitsuri, shinobu, Muichiro, and surprisingly Giyuu, where all playing, obanai was participating aswell, wich you didn't expect

Obanai was standing by the Christmas tree, Mitsuri convinced him to wear this large red coat with white fur trim, that made him look like Santa

You reached your hand into the hat, you pulled out a piece of paper, upon opening it, you see "Obanai iguro" written on the paper, meaning you'll be his secret Santa this year