This alternate take on World War II is adapted from Aramaki Yoshio's novels and builds on Japan's successes in the earlier series. After Germany declares war on Japan, the Japanese navy extends its reach into the North Atlantic and confronts the Kriegsmarine, opening a trans-polar route between Japan and Great Britain. Germany also carries out a surgical strike on the White House, which brings the United States back into the war as Japan's ally. The Germans attempt an invasion of Britain as well, and the Japanese fleet sets out to push the invaders back.