In Endless Era 86, the war that lasted eleven years between the Neo Sprites and the Interstellar Government of Peace and Justice ended with neither side winning. In the last battle now named "Justice's End" the evil Goug Empire appeared and declared war on the Earth and all the planets that were allied with the Interstellar Government of Peace and Justice, to seize control of the planet's resources. Thanks to the use of combat mecha known as Cavaliers, the Goug Empire easily overwhelmed the IG's conventional fighters. The conquered Earth was stripped of its name and identity, becoming just "Planet 10,000" In Endless Era 89, the Earth is still enslaved by the evil Goug Empire but there is hope. A mysterious group called the "Soldiers of Zion" has appeared with Humanoid Fighters (HF) of their own to deal with the totalitarianism of the Goug Empire. This is where our story begins....