The year is 2291, and the citizens live a peaceful existence after the catastrophic war between the humans and the Yuman. This quiet life is about to be shattered, the leader of the Yuman is not convinced the war is over, and now plans to renew hostilities! (Source: AniDB)

Heroes of old appear to return peace to earth.

Teppei have managed to defeat Machine Empire’s forces time and again, escalating his rescue attempt of his brother into an all out war! His courage has even earned the support of the Empire’s Spiritual Guardians. Together with Teppei, they now seek to learn Machine Empire’s true motives and put an end to their rampant destruction. […]