Warfare has often devastated kingdoms that once flourished magnificently, leaving the country in ruins. Just when resurrection appears to be on the horizon, an outbreak of the enigmatic Yellow Zombie Virus occurs. The virus carriers get disoriented and begin assaulting others. The survivors are forced to live inside walled cities for security, relying on a type of energy known as "Trinity," which has generated societal inequality and much warfare. Each fortified city is separated from the others by walls, and each kingdom is administered by a lord. Since the death of the previous ruler, Lord Dong Zhuo has been acting in an inappropriate manner. Liu Bei Unicorn Gundam encounters Guan Yu Nu Gundam and Zhang Fei God Gundam, as though brought together by fate, and chooses to join them.