This is an upcoming online fighting game for the PC, "Blade Symphony". It features a unique behind-the-back third person perspective. This is a Source Engine mod, so it requires that you have an existing Source Engine game installed on your computer to run it.
Please keep in mind that this is still in development.
And here's a demonstration of the gameplay from one of the developers:
I managed to get into the closed Beta, it's incredible so far. The battle system is unique and deep, relying not just on combos but on strategic use of the three stances and careful footwork.
My friend who's pretty much lives and breathes fighting games says it actually looked promising to him, much better then he expected. In my eyes that just pretty much says it has at least some good credit to its name.