Shuumatsu no Walküre Kinden: Kamigami no Apocalypse

Zeus, supreme chairman of the Council of Valhalla, announces to the gods twelve of the thirteen fighters set to participate in Ragnarok—and is met with the dissenting voices of those who were not chosen. However, Zeus has foreseen this, and immediately declares the holding of another tournament to decide the final spot on the Ragnarok lineup, one which will break the taboo on gods fighting one another. Thus begins the "Revelation" of the untold side of Record of Ragnarok!

(Source: MU)