Asagi and Sakura infiltrate the floating town of Tokyo Kingdom to dismantle the terrorist organization Dragon, only to be captured by a clone of their nemesis, Oboro. After enduring brutal physical and psychological torture designed to awaken their dormant powers, Asagi manages to break free, only for the original Oboro to return as a vampire and seize control. Three months later, the sisters appear to be broken slaves under Oboro's rule, while secretly coordinating a plan with another shinobi to finally eliminate her.