Makki and Mattsun are believed to be the closest friends out of the Seijou group, however the truth is it only looks like that on the outside. Their friendship is barely held together by memes and their joy in making fun of Oikawa. During the Great King's birthday party, he forces the two to participate in the game known as seven minutes in heaven. That single event changes their relationship for good.

Kyoutani x Yahaba one shot based off a comic I've seen floating all around Instagram