Sven is your run-of-the-mill sweeper (aka bounty hunter) - down on his luck, haunted by the perpetual grumbling of his stomach and looking to make enough cash to get by. Oh, and he can see the future, but only about five minutes into it. When a dirty politician lands a price on his head, the sweeper jumps at the chance to earn a quick buck. But as he's working to secure the target, his vision reveals an assassination that will cost him the job.

Sven is your run-of-the-mill sweeper (aka bounty hunter) - down on his luck, haunted by the perpetual grumbling of his stomach and looking to make enough cash to get by. Oh, and he can see the future, but only about five minutes into it.

As all attempt to hide and heal, Train's conscience grows deep... Deep enough to make the decision to leave Chronos for good. Unfortunately for him, the life he has left proves unwilling to let him go. Creed is sent out to retrieve their best assassin, but when he fails to bring Train back into the fold Sephiria sends her officers to make sure things go right.

As all attempt to hide and heal, Train's conscience grows deep... Deep enough to make the decision to leave Chronos for good. Unfortunately for him, the life he has left proves unwilling to let him go. Sought by both the Chronos Numbers and the new Taoist rebels working against them, the former assassin loses faith when he loses a friend. But his newfound companions, Sven and the young bio-weapon Eve, teach the stray cat a new way of life...

Friends watch their company grow while foes are slowly whittled away. Losses for both the Chronos Numbers and the Apostles of the Star can only be good news for the hunted Black Cat. But as one slowly slips from power, the other quickly rises in their wake. And when the largest bounty ever offered lands on the head of Creed Diskenth, Sven will use any distraction to keep Train's vengeance from awakening anew.

It is the eve of the battle between the Chronos Numbers and the Apostles of the Star, and an understudy has stepped onto the stage. This stray alliance follows the code of the Sweeper. Creed Diskenth has unleashed new and terrible forces onto the world, having damned it as corrupt. For this, he must be punished. But as Black Cat extends the hand of salvation at the hour of defeat, the curse will be to live out a life of repentance... Life, not death.

As the world rejoices in its newfound freedom from terror, their celebration is short-lived as an even greater threat reassembles from the wreckage: The Zero Numbers. Led by traitors from both sides, this new enemy is bent on establishing a "world peace" where salvation comes at the cost of humanity.

Sven is your run-of-the-mill sweeper (a.k.a. bounty hunter): down on his luck, haunted by the perpetual grumbling of his stomach and looking to make enough cash just to get by. When a damsel in distress enlists his aid, Sven crosses paths with the worst possible luck: Black Cat (a.k.a. Train Heartnet). At odds now with the branded assassin, Sven seeks to save a young girl before the unlucky Number can carry out his mission.

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 life on his own terms as an easygoing bounty hunter. But is Train's past as far behind him as he thinks?

The battle between Creed's Apostles and the Cerberus Team ends in a draw, with serious wounds on both sides. Just when Train thinks he can relax again, his friends Sven and Eve are captured by Creed, who believes that killing them is the only way to get Train to join him. Now Train has to race to save the only people he can trust.

Charden and Kyoko have deserted Creed's Apostles of the Stars and joined up with Train and Sven. But it won't be easy to protect them, since Train has been shot by a nanotech bullet that turns him into a little boy. Rinslet goes in search of Dr. Tearju, who developed Creed's nanotechnology and may be the only one who can return Train to normal. But will Rinslet find the doctor before Creed or Chronos finds Train?

In order to revert back to his regular-sized self, Train sets out to see Dr. Tearju, a woman who bears a striking resemblance to the girl Eve. But before she can help Train return to normal, the Apostles of the Stars come crashing in, with the intent of forcing Dr. Tearju to join their ranks. A mysterious new weapon may be the only hope for keeping the Apostles at bay!