A chance rescue ties the fates of Dafeng and Li Huamei together. Dafeng, a mysterious young man bound for Kyoto to find his senior sister, saves Li Huamei after an ambush leaves her gravely ill, and the two find themselves traveling the same road. Along the way, Li Huamei learns to her shock that her own senior sister is Queen Qin Zhao, the ruler who has repeatedly sent assassins after her. Determined to learn why, the pair place their lives in each other's hands and fight their enemies side by side. As strife spreads through the martial world and power struggles at court grow fiercer, they are drawn without realizing it into a treacherous conspiracy, and Dafeng turns out to be the key to unraveling its mysteries. The 48 ONA episodes deliver steady action.