Taira Nagi, once the strongest assassin, was confined to a wheelchair after falling unconscious protecting his younger sister, Taira Shizuka. Shizuka works as an intermediary for assassins, taking on assassination requests and taking her brother to the battlefield under the guise of "rehabilitation." Hoping for her brother's full awakening, Shizuka accepts a request to eliminate Arashiyama Goro, the boss of a vicious gang of robbers.
