In the future, mankind has learned to navigate space ships. Human beings spread out to different planets of the Milky Way. The hero of the game is a young pilot named Harry. He was testing the newest spacecraft model, but it crash-landed on Menaris, a planet at the outskirts of the Eva solar system, with a medieval-like civilization. Turns out that repairing the ship will be anything but easy, so Harry decides to stay for a while and to help the inhabitants of Menaris with their problems, which involve the over-ambitious Doran Empire. With the help of Aria, princess of Menaris, Harry must discover the truth about Doran's intentions, and when he learns it, he realizes that he won't use the repaired ship to return home, but will have to face something that threatens the entire galaxy.

Star Breaker is a fairly traditional Japanese RPG, with top-down view, world map navigation, random turn-based battles, and all the other usual ingredients. Battles can be set on Auto for quicker pacing. Since the setting of the game is a mixture of sci-fi and medieval fantasy, character use a variety of weapons from swords to guns, as well as special psychic attacks. There are also some space ship combat in the game, and it is possible to upgrade the player's ship later on.