Train Heartnet, also known as ""Black Cat,"" was an infamous assassin for a secret organization called Chronos...until he abandoned that cold-blooded existence to live on his own terms as an easygoing bounty hunter. But is Train's past as far behind him as he thinks?

As a SweeperAfter fighting their way to the center of Creed's Hideout, Train and Sven find their way blocked by the unexpected appearance of the Chrono Numbers. They're stopping the Sweepers so that they can take down Creed by themselves. But the Numbers find their own surprise--Creed appears to have become indestructible!