Japanese GT Championship (FKA JGTC) with GT500 and GT300 races. I found Nismo TV on Youtube has all of the series, plus a few other racing series as well.
Jensen Button, Heikki Kovalainen and Kamui Kobayashi are competing in the series this year.
https://www.youtube.com/user/nismotv2013
Also, it should come as NO surprise that there's a Hatsune Miku livery, because Japan