Shuumatsu no Valkyrie - Gods' Apocalypse is a spin-off Japanese manga series written by Otsuhiko Naruse and illustrated by Ippei Okamoto. Zeus, Supreme Chairman of the Council of Valhalla, announces to the gods the names of 12 of the 13 gods who will compete in the final battle between the gods and humans. Then, criticism erupts from the gods who were not selected. Zeus, who had foreseen this, declares on the spot that a forbidden festival will be held in which "gods" will fight "gods" in earnest for the last spot. And so, the full picture of the apocalypse, never told in the original work, is revealed!