I just got into mystery shows actually but I sawed vampire prosecutor first, then when I saw MR. BRAIN it really reminded me of it. They give off the same feeling and some of the cases are similar. They are both enjoyable to watch.
Because Kimura Takuya are in both dramas and he´s character is quite similar in both shows. Not to mention the feel of both dramas are kind of similar with mystery, crime, thriller etc.