* WW2 revisionism, based on novel series by Aramaki Yoshio.

After Germany declares war on Japan, the Japanese navy begins challenging the Kriegsmarine in the North Atlantic, paving the way for trans-polar travel between Japan and Great Britain. The Germans also launch a surgical strike on the White House (which drives the US to rejoin the war as Japan's ally) and attempt to invade Great Britain.

Source: Wikipedia

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Same setting: Konpeki no Kantai
Same setting: Konpeki no Kantai Tokubetsu Hen: Sourai Kaihatsu Monogatari