Black Cat

An organization called Chronos rules in the shadows to much of the politicians and economic activities, they oppose them. The story begins when Train, known as Black Cat, one of the organization's most powerful assassins, meets a strange woman named Saya Minatsuki, who always wears a flashy kimono and softens her heart. So he decides not to take orders from anyone again or kill for no reason. Saya is killed by Creed, who calls her a witch, well-rewards together with him and Eve the girl he cares for, a mysterious girl with supernatural powers based on Nanotechnology and artificially created by Dr. Tearju Lunatique.

Later, Train learns that Creed is forming an alliance known as "The Apostles to the Stars", whose goal is to destroy Chronos and create a new world order. At that moment Train decides to go after Creed as a bounty hunter to avenge the death of his friend Saya.