A called organization Chronos governs in the shades to great part of the politicians and the economic activities in search of the order. Their members assassinate without mercy to everything what goes bad or is against them. History begins when Train, well-known like Black Cat, one of the most powerful assassins of the organization knows a strange woman who always dresses kimono showy and softens her heart. Then it decides not to return to receive you order of anybody or to kill without reason and leaves the organization being persecuted by this. Then it knows Sven hunt-you compensate very peculiar and begin to work as hunt-you compensate next to him and the girl who this takes care of, a mysterious girl with supernatural powers based on the created nanotecnología and artificially.