Vampire Rain is a horror-themed action game being developed by Artoon and published by AQ Interactive. IGN describes the plot of the game as such, "Vampire Rain takes place in a city in suburban Los Angeles, where vampires have been determined to reside. Players take control of a special operative called John Lloyd and, having entered the city, must wipe out the vampires."
There's a multiplayer mode as well, though we don't know the full details.
Check out these new multiplayer screenshots: