Since the last play… No, since the game just started, Akihiro had already noticed one thing from Riku. The Blonde boy always loved to show off. No matter which kind of play he would pull, he would somehow grin provocatively as if screaming 'Here is another trick from me!'.
At first, Akihiro thought the blonde boy did that deliberately to provoke some sort of reaction from the opponent. However, after observing for a while, he knew by now that Riku's trademark smirk before trying to catch them off guard was like a natural reaction. He doubted the blonde boy knew he showed such an infuriating smirk a lot during the game.
Unfortunately for Tsunemori, Riku's unconscious habit made it easier for Akihiro to read his game. He somehow realized that whenever it was Yuki who would be the setter, Riku would show his trademark smirk as if saying he wanted to pull their leg. He confirmed his theory for a few times while sacrificing two or three points for the Tsunemori before he was sure of it.