The world is secretly controlled by a secret organizition, Chronos. Under the command of this mysterious organization, are the Chronos Numbers, a group of powerful assasins, taking orders to eliminate certain target secretly to keep the so-called 'peace'. One of the most powerful is the Number XIII, Train Hartnett, or known as Black Cat. At first he seems to be a cruel killer, a meeting with a girl Sweeper changed him completely. Now as a Sweeper, Train travelled with his partner Sven Volfied to hunt down criminals.

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