In 2020, mysterious alien lifeforms called Pillars appear, threatening the existence of humanity. When even nuclear weapons fail to destroy them, the world's leaders are left wondering how to resist. Suddenly, a boy claiming to be Odin appears, promising to help humanity battle against Ragnarök by providing Valkyries who have the ability to destroy the Pillars. However, instead of modern jet fighters, Valkyries fly magically enhanced propeller driven fighters. In 2025, after a successful but costly attack on a Pillar in Europe, S-class Valkyrie Claudia is transferred to Japan. On the way there she is ambushed, but is assisted by a local, inexperienced Valkyrie squadron...