Dang.... this was some nice development there between Tsuzuki and Rikai. Its hard to determine whether or not Rikai is emotionally manipulating Tsuzuki so she can read him better, or whether its the same case as her father, where she can't + doesn't want to read him, but after this level of sympathetic bonding, will be able to automatically. His expressions definitely point to him being directly related, since his "will you really kill the culprit?" certainly implies he knows who did it(whether himself, his sister, or some other party that is important to him). I'm sure Rikai sees this too, but still wants to know(e.g. via her ability) concretely that he does.