A sly thief penetrates the hollow halls of Kyosho Academy to steal Hyakuhekitou (Hundred Stoned Sword). The combination of the three sacred artifacts justifies the empire's omnipotent power. The leaders will send Kan-u to hunt down these criminals. However, Shibai, Chouryu, Kaku, and Jyunyu believe a spy is hiding in their midst. Will Kan-u and her friends be able to protect the empire?