Three ancient giants wake up to find their galaxy already conquered. Only one of them has enough power left to fight back, so they have to decide who deserves to survive. A four-episode ONA that treats a premise built for a browser game like it matters, cutting straight to the weight of choosing which god lives and which god dies.

Three colossal robots slumber in a parallel dimension called the Cosmic Ark, their power nearly depleted after eons of dormancy. When they awaken to discover their galaxy consumed by the tyranny of Chaos, a grim reality becomes clear: only enough energy remains to resurrect a single Ark. The three remaining giants each embody Wisdom, Courage or Strength, and whichever one returns will carry the fight against Chaos. Three rival Unions form, one devoted to each great Ark, and they compete to see their own champion revived and the fate of the world decided. Alongside this central conflict sit the stories of individual figures, such as Crimrose and Ivis, Eihwaz, and Eris and Resha, in a four-episode mecha drama.