Black Cat is a manga by Yabuki Kentaro, and spans 20 volumes. The manga is not licenced yet.
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Black Cat is about an ex-assassin dubbed Black Cat with the number XIII tattoed on his chest. Black Cat a.k.a. Train Heartnet left a secret society named Chronos after an event that happened while he was in. Now he's travels around with his partner Sven Vollfied as sweepers (the term in the series for a bounty hunter). While conducting their regular sweeping business they take on a girl with nanomachine transforming abilities named Eve, and Train's old partner Creed tries to take over the world. (Source: thedbarchives.)
Years of Released: 2000
Author: Yabuki Kentaro
Artist: Yabuki Kentaro
Genre: Action, Comedy, Drama, Sci-fi, Shounen
Train Heartnet, also known as "Black Cat," used to be an infamous assassin for the secret organization Chronos. That is, until he abandoned his post as a cold-blooded killer and went to live on his own terms as an easygoing bounty hunter. But is Train's past as far behind him as he thinks?