15 years have passed since the end of the nuclear war. The survivors have built colonies in various parts of the devastated world to make their homes. However, over these 15 years, the concept of nations has been lost, and the powerful people who govern the colonies now control politics and make the laws.
This colony established on the coast is one such city, ruled by some of these powerful people: a gang called the Shadow Warriors.
Since their rise to power, the gap between rich and poor in the colony has intensified. People living in the slums struggle to get by, and there are constant rumors of mysterious disappearances.
The Lee brothers, masters of the Sosetsuken, live in a corner of the city with their childhood friend Marian.
The honest younger brother Billy and the free-spirited older brother Jimmy.
When the Sosetsuken dojo they inherit ends up in the way of the city's evil schemes, the story begins...