When Shiro's train of thoughts continued to run wild, Ryo took his leave, to prepare for the final day. He needs to be ready for any outcome. For better, for worse. Although, all he wants is that she ends up succeeding.
If things turn out for the better, and that boy manages to make a successful move, then it's all fine, and she can move ahead. But if not, Airi is going to be lost forever, with no way of returning, or to be free.
