As humanity's long reign nears its end, the gods convene every millennium for the crucial Conference of Mankind Survival. With unanimous consent to end mankind due to their folly, Brunhild, the eldest of the 13 valkyrie siblings, interjects. She suggests a twist: a test for humans. The proposal entails a face-off between the omnipotent gods and history's mightiest champions in a series of one-on-one duels called 'Ragnarok.' To secure victory, one side must triumph in 7 out of 13 battles, a daunting task for mortals against divine beings. Despite initial scorn from the gods, Brunhild's challenge stirs their pride, leading them to accept. Now, Brunhild and her sisters face the daunting task of selecting humanity's champions in a last-ditch effort for survival. Can humans best the gods and avert their impending doom? The epic showdown between heaven and earth commences in a climactic battle for existence.