After a series of natural catastrophes and global economic collapse, the world has become a lawless place. Anarchy rules the streets, and warlords take power by brute force. The ruined cities are filled with street children and orphans who are terrorized and robbed of their food and last possessions. One warlord is Bosco, a ruthless killer who is obsessed with perfecting his power through martial arts. Together with his partner, he kills Master Thach, keeper of a sacred book of martial arts. Jonas, Master Thach's last pupil, survives Bosco's attack and returns to the city to reclaim the book and end the warlord's tyrannical rule.