When Hinata suggests that the team goes on a roadtrip to Kyoto for their victory trip, Suga is quick to jump on the idea, thinking it would be a good time to bond with his teammates after their big match. Unfortunately, Tsukishima and Yamagutchi decide not to go, but everyone else agrees. It's become obvious to Suga (though maybe not the others) that Kageyama and Hinata are dating. Their attempts to hide it consist of amping up their rivalry, but Suga, unlike the others, always catches them when they smile at eachother after a particularly good game, and their holding hands as they leave the gym. The way they use eachother as stands when they've finished practice. It's becoming increasingly obvious, and Suga is to a point that he can't stand the fact that they won't tell anyone.
Kageyama and Y/n studied in the same middle school. Although Kageyama had been madly in love with Y/n since he first laid eyes on her, his anxiety and second thoughts always get the best of him and this was how he lost his chance since Oikawa beat him to ask her out. Oikawa and Y/n's relationship didn't go well and what happened was a mystery. Kageyama tried to talk to her on the last day of middle school but couldn't get the courage to. Unbeknownst to him, life gives him a second chance when they end up in Karasuno, giving him another choice to pursue her.