Train Heartnet A.K.A. number 13 of the secret society Chronos, is known as the Black Cat thanks to his quick reaction times when engaged in combat. He is an unbeatable master gunman and a cold and unfeeling killer until he meets Saya, a bounty hunter, or "sweeper".
She teaches him the value of a human life, that one should live to repent for one's mistakes rather than die because of them. Through her, Train learns to love and care for others as he too becomes a "sweeper" and travels with his partner Sven and the mysterious girl Eve.
The opening episodes of Black Cat introduce an interesting bunch of characters and given them a chance to show off a little, while giving you enough information to see where the story is going without really getting too meaty. There’s a reasonable amount of light comedy thrown in as well (usually around Sven’s permanent lack of cash) that helps to keep a fun atmosphere about the story. The end result is a show that’s going in an interesting direction and is simply fun to watch, and that makes it one that’s worth keeping an eye on.