Kagatobi Mai is the tragic heroine who lost her father and the sacred treasure of the Kagatobi clan. To exact revenge, she enters the fighting tournament "Kaiser of Fighters," hosted by Guilliam Hazard. Utilizing the Kagatobi ninja arts, she defeats opponent after opponent, but her path is far from easy. In her first battle, she gets caught in the underhanded attacks of Mr. Hippogriff and finds herself in dire peril. However, by unleashing the ultimate techniques of the Kagatobi style, she crushes Mr. Hippogriff. Next, she faces Guilliam Hazard's right-hand man, Kawasaki Ryuko, the ruler of the underworld and the leader of the assault team that attacked Mai's village—the man she hates most. In a fierce and brutal battle to avenge her father and reclaim the stolen treasure, Mai pushes herself to the limit. But can she truly overcome the ultimate power of Guilliam Hazard?