The movie is based on a popular 11-volume manga series from Japan titled Bokko. Back in the Warring States in 243 B.C., China was torn among seven states, each with their own individual ruler. Smaller and weaker states often fell prey to larger and stronger ones as their ambitious rulers strived endlessly for expansion through invasion. State Yan was one of those unfortunate victims, with State Zhao eyeing them to feast on. The troops from State Zhao, led by daring Commander Xiang Yanzhong, were determined to take over State Yan. They knew they had to control of City Liang, on the outskirts of State Yan, in order to win the battle.