Anime Profile: Black Cat

This anime is based on a manga of the same name, however the stories in both start differently. In the anime, Train Heartnet is an assassin with the Cronos organization, and Eve is a young woman that was a test subject for nanomachines making her a living weapon. Eve joins up with a guy named Sven, while Train goes to attack Torneo Rudman because he was ordered by Cronos to kill him as well as Eve. After this, he leaves the Cronos organization, and then Creed Diskenth kills Train's friend, Saya Minatsuki.

In the manga, Train Heartnet is a former assassin that has turned sweeper after his partner, Creed Diskenth, killed Train's dearest friend, Saya Minatsuki. With his new partner, Sven Vollfied, and infamous female thief, Rinslet Walker, Train goes against Torneo Rudman for the large bounty on the mob boss' head. During this they encounter Eve. After defeating Torneo, Eve joins Sven and Train as a sweeper (she has a crush on Sven).

During the rest of the series there are many encounters with Creed and his group of terrorists, The Apostles of the Stars, who try to bring about a new world order. After finally defeating Creed, complications arise due to the real reason that Eve was created (the last part is in the anime but I am not sure about the manga).