Prologue?

X invited all of the letters including Four to his sleepover, but the letters don't seem to get along with Four very well. There are party games, food, movies, and more stuff that they can enjoy in X's sleepover. X just wanted to invite Four because they're best hosts, so he tries to make the other letters befriend Four as well.

4/25/2021 - BFB4 in #1 (ok wow I'm impressed!)
3/13/22 - 4x in #5