A week after Japan got transported into the New World, the South China Sea escalated to a near outright war to do Japan's absence. Before any hostility could be made, South Korea and the Philippines suddenly vanished.

One day all the nations, and continents of the world known as Earth were suddenly transported to another world, the nations of Earth realize they're in another world, can the New World survive the earth's military powers? Antarctica included.

Lance Corporal Tanaka and his friends of the 7th Recon were dragged, along with the entire 7th Division, into a long campaign of liberating an occupied medieval kingdom in a time where Japan found herself involuntarily embroiled in a war against a hostile empire that was 70 years behind in technology. This is a story based on the novel "Japan Summons" written by Minorou.

The Emissaries of The Sun God were an unknown group of individuals who, aided in the defeat of the demon lord's armies 10000 years ago, they bear the crest of the sun, their metal ships with terrifying magic, they're metal beast, who can kill Ogres within seconds, they are the Emissaries of the Sun.