Frienemies (Kakashi y Gojo)

During the fight with Kaguya Kakashi falls into one of her portals and gets transported into a different dimension. He meets an annoying white haired man-child and learns about curses and cursed energy and about Sukuna. To be able to earn their trust he is forced to work with Gojo to defeat curses and retrieve the fingers of Sukuna. Sadly they're a few twist of events as Gojo somehow gets captured by some unregistered special grade cursed spirit and with the help of allies from the leaf. Now Kakashi has to rescue him and couldn't help but miss his presence and will do anything to save him.