Zangeki no Reginleiv (Nintendo Cinematic Universe)

Zangeki no Reginleiv is a Japanese graphic novel.

Summary
With Ragnarök on the horizon, the divine warriors Freyr and Freyja must destroy the Jötunn.

Plot Elements

 * In the world of Midgard, humanity comes under attack from the Jötunn, a race imprisoned by the gods of Asgard after a prolonged war.
 * In response to this attack, Asgard dispatches the twin deities Freyr and Freyja to aid humanity in defeating the giants.
 * As the battles escalate, it becomes clear that the apocalypse Ragnarök is immanent.
 * Despite their best efforts, Freyr and Freyja cannot stop the Jötunn's advance.
 * The situation is worsened by the emerging armies of Niflheim and Muspelheim, and the release of three demonic weapons created by Loki during an earlier war with the giants.
 * Asgard itself is eventually assaulted leading to the death of all the gods except Freyr and Freyja, followed by the final emergence of the Fire Jötunn Surtr.
 * The world is left in ruin after Surt's defeat, but Freyja uses her powers to restore the world and humanity, with the gods being reincarnated as humans.