Responses

you can see in the last page...when kuga was trying to compete with yashiro, in the sense of who knows kageyama better...or how he laughed when kageyama said "I thought I was more perceptive than this". Before that, he said "without realizing it, you're merciless" to kageyama when kage said he never thought yashiro can fall in love with anyone because yashiro has been in love with kage for a long time and kage didn't realize it.
So Kuga knows that Yashiro loves Kage?