The story revolves around Train Heartnet, a gunman who works for the organization called Chronos but decides to leave the organization and lead a different life as a bounty hunter with his new gang. Important themes in the series are choosing one's own road and coming in terms with past. Story is very humoristic with a lot of comedy relief. The fight scenes are mixture of guns and other 'believable' weapons and different 'powers', giving the show a fantasy element.
The comedy is one of Black Cat's strongest points, and it's superbly expressed, having it's own special rhytm and flow. The characters are very charismatic and both contrast and complement each other. Especially the 'main trio' is crafted in a manner that allows lot of spontaneous apparing jokes to spring out from their interaction.
In a nusthell, Black Cat is nice and easy shounen anime. It's enjoyable, but don't memorable. While some scenes, especially in the earlier episodes, are darker than the others, Black Cat doesn't even either even aim for being remembered for it's heart breaking moments or fails at it. Also, a lot has been lost in the translation between the manga and the anime. While the anime isn't bad, it could have been a lot of better if the producers hadn't taken some of the many liberties they did.
