No clue if this has been found out before or not(I didn't see this combo in the combo list), but you can loop 6C>236A for a bit(most I can do is 7hits).
I thought it was neat, but it's prolly not really practical.
http://youtu.be/x6iJ0CVrN_s
But anyways, I just picked the game up and I'm having a blast playing akatsuki.