Defend your home planet against the Seven Stars Alliance! In the galaxy of Tetranova, a firece war between seven stars has laid waste to their planets. Having destroyed eachother's homes, the seven stars have formed an alliance to seek a new home, where they can rebuild and regain their strength to go to war once again. You must pilot the fighter ship SYD against the deadly fleet of the Seven Stars Alliance. The fate of Earth rests in your hands!