Two years ago, train, a high-level assassin known as number xiii in chronos, left the secret society to live by his own rules. Since then, train has been a sweeper, a bounty hunter, catching criminals and bringing them i...Two years ago, train, a high-level assassin known as number xiii in chronos, left the secret society to live by his own rules. Since then, train has been a sweeper, a bounty hunter, catching criminals and bringing them in alive.