It is the latest fighting game from Capcom, in their famous "vs." series (Marvel vs. Capcom, Capcom vs. SNK).
Tatsunoko is an anime studio, so it is their characaters fighting against the likes of Ken and Ryu from Street Fighter and Morrigan from Darkstalkers, among others.

As you can see, the game looks amazing in the video. People really need to write Capcom to tell them to localize this and Prep it for American release. Rumor has it that Capcom might do this by swapping out the Tatsunoko sprites with some American super heroes (a la Marvel vs. Capcom). Although the original game is fine, if it takes that IP switch to bring this game here, that's cool with this blogger.

Go to Capcom and tell them to give us Tatsunoko vs. Capcom!