[Kou glances over his notes. He feels satisfied; maths was understandable, and something he could grasp. The friendships he had made were more complicated; in a year this would be over and he would be doing something new, and be away from them.]
[He notices Kai's exasperation and decides to be helpful.]
[He nods in reply, and sit backs and waits for whatever needs asking. He doesn't like saying much.]