In the space year of 2999, the powerful Bismark Empire has decided to launch an attack on the planet Earth. First however, they must occupy a small planet named Star Lenion so they can use it as a launching point for their main attack on the planet Earth. So far on Star Lenion, the Bismark Empire has built a base and are in the process of building a powerful super weapon called the Baltron. The Earth Defense troops have to destroy this base before the Baltron weapon becomes fully functional. In this game that is a scrolling horizontal shooter similar to Defender, players take control of the fastest Earth starship called the Gistorias. It can attack enemies with its laser and air-to-ground bombs. Gistorias can also unleash a flash smart bomb clearing the screen of enemies. You can move the ship both right and left, change speed from slow to fast, and can also use a warp boost to try and escape from perilous situations.