The game's story focuses on a group of young people from Earth caught up in a war between a group of rebels and a government controlling the solar system. The game is set in the future, where the majority of humanity is ruled by a group, called the Commune, that lives in a giant space station named Ondina orbiting the Earth, which oversees the development and expansion of humanity throughout the solar system. A group of rebels called the Inverse, based on Mars, are rebelling against what they see as an oppressive government The primary weapons in the fight are space fighters called Cruise Chasers, which can transform into giant robots using the "Blassty" system; other types of space fighters are also used. The player may choose whether the Inverse or the Commune win, giving the game two different endings.