Black Cat is about A sweeper, "Sven Vollfied", is hired to partake in an mission concerning an election, and inevitably becomes witness to an assassination by the Chronis Corporation. The corporation sent their best man, codename "Black Cat", to do the job, and the assassin finishes the job with cold, calculated ease.
However, things are not all well, even in the large and powerful corporation known as Chronos. Black Cat himself eventually deserted the corporation and is joined by Sven in releasing the nano-bioweapon Eve from a black market dealer. With Rinslet completing the group, they travel around working as sweepers. But there are darker shadows in the horizon, and our intrepid gang may find themselves fighting for their lives against supernatural forces who are most interested in Chronos, or, to be more specific, their top ranked assassin, Black Cat