Black Cat (ブラックキャット Burakku Kyatto ) is a Japanese Shōnen manga series written and illustrated by Kentaro Yabuki. It was originally serialized in Japan in Shueisha's Weekly Shōnen Jump. It was later collected in twenty tankōbon volumes from January 11, 2001 to October 9, 2004. The series was adapted into a twenty-four episode anime series by Gonzo studio. It debuted in Japan on the anime satellite television network Animax and the terrestrialTokyo Broadcasting System network on October 6, 2005 with its final episode airing on March 30, 2006. The story centers on a man named Train Heartnet who withdrew from an elite group of assassins called the Chrono Numbers (時の番人 Kurono Nanbāzu ) to become a bounty hunter, or Sweeper.
Viz Media licensed the manga series for English-language publication in North America and as of May 2009, have released all 20 volumes of the series.Funimation Entertainment licensed the anime series for North American broadcast where it was broadcast on the Funimation Channel. The series later were released on six DVD compilations, as well as a Complete Series boxed set.
Chronos, an organization bent on world peace, rules one third of the world's economy. To maintain the balance of the world, Chronos is therefore essential, and there is a need for people to protect Chronos. Thirteen special elite assassins each possess unique orichalcum-forged weapons and are called the Chrono Numbers, assassins who work for Chronos. When the thirteenth Chronos Number (Train Heartnet), also known as the infamous Black Cat, meets a Sweeper (licensed bounty hunter) named Saya Minatsuki, Train's morals and values are changed from those of Chronos's to those of his own. Instead of killing his victims like he is ordered to, he merely uses Hades (his orihilcon gun) to stop them instead. This leads to tension between him and the Chronos Elders, the leaders of Chronos, and eventually culminates in Train's departure from the organization. Creed Diskenth, a Chronos assassin, resents the way that Saya changed Train's life, and murders her. Two years later, Train is an easygoing Sweeper, traveling with his partners Sven Vollfied and Eve, when Creed appears before Train once more. Creed, now with followers and power that rival anyone alive, including the numbers, vows to get Train to join him. Train must choose his friends and new life, or revenge, as Creed threatens to undermine Chronos and start his own World Revolution.