Shortly after the events of the first Darius, protagonists Proco and Tiat help refugees from the planet Darius flee from the destruction caused by the Belser Army. They eventually find and set up a temporary colony on a planet named Vadis. Suddenly, Belser rises again and launches a surprise attack on a spaceport on Darius, which was being used to help ferry the remaining Darians to Vadis. The remaining refugees are killed, and Belser sets course for Vadis. A fleet of Silver Hawks are sent to fend off Belser, but are easily annihilated. Once again, Proco and Tiat are given no choice but to fight off Belser once more.