The year is 2163, and the badly damaged R9 Arrowhead fighter has just returned to Earth after its mission to destroy the Bydo Empire. The vessel is rescued by the battle-cruiser Croque-Monsieur and transported to an orbital space station. One year later, astronomers in Central Asia observed mysterious objects falling from the sky, and moments later, control was lost over the orbiting annihilation platform Moritz-G. This high-tech machine, capable of destroying the entire planet, descends over a city and levels it to the ground. Although its planet-destroying weapons have not yet been activated, its advanced defense systems make Moritz-G virtually impossible to approach. A desperate military operation is launched, and the prototype ship R9aII Delta is deployed to resolve the situation. Thus begins the epic battle that is R-Type Delta!