The connection between Athena and the mysterious figure is revealed along with the figure's identity. Godou rushes off with Athena while the others stay behind to try to buy enough time for the Authorities Godou used up battling Ama no Murakumo to recharge. Fortunately, thanks to Godou, Erica has an ace that'll let her fight almost at the level of a Campione. If Godou can't defeat his new opponent, then Princess Alice's prediction of the world enveloped by the Starless Night (which was mistakenly attributed to Athena) will come to pass. He'll need the help of all five girls to achieve victory.
強大なまつろわぬ神が顕現し、世界は闇に落ちようとしていた。先の天叢雲劍との戦いで力を使い果たしていた護堂に、今は対抗する術がない！ エリカたちは己を盾に、護堂と戦局の鍵を握る少女を逃がす…が、圧倒的なまつろわぬ神の力に、善戦も空しく倒れていった。 離脱した護堂と少女は、日本最大のパワースポット・富士山山中の祠に逃げ込んだ。権能を回復していく中、護堂は少女と心を通わしていく…。そしてついに、まつろわぬ神が護堂の前に到達！ 最強の神とカンピオーネ、その戦いの行く末は…!?
