aaaawwwww!! Kageyama and Hinata are indeed in a relationship and they're enjoying the winter at full as a lovey-dovey couple, doing a snowman, having a snowballs fight and celebrating Kageyama's birthday "as a couple". So lovely.
Kageyama walks Hinata to the bus stop during a winter night. While these two walk they flirt naturally with each other. Lovely.
Haikyu!! Dj - Snow Step!