The Corporation - Book One - The Showa Project

Initially led by Emperor Hirohito in 1945, the Japanese planned and carried out a grand deception that kept their intentions hidden from the world. Leadership was delegated to the Takeda family, who pursued the Emperor's wishes with a ruthless efficiency, where murder and blackmail were commonplace. Project Showa (named after the official designation of Emperor Hirohito's reign, meaning "Enlightened Peace"!) became a juggernaut with a single focus!The Takeda's controlled a Japanese secret society, called the Kokuryukai or Black Dragon Society.
This was an organisation of ultra-nationalists, founded in 1901, and named after the Amur (Black Dragon) River. This society fulfilled a similar role to the Nazi's Gestapo, installing a reign of fear and obedience. The Japanese established a giant corporation called Mitsoma that was the front for all their activities. A few within the British establishment began to realise the true intentions of the Japanese, this realisation led to the forming of a covert and unofficial small military force called the Guardians, whose sole purpose was to resist the suspected Japanese invasion.
To keep their intentions secret the Japanese purchased, via the Russian Mafia, substantial ex-Soviet armaments, including two nuclear powered submarines, an aircraft carrier and T-72 tanks. Project Showa reached its final phase long after Emperor Hirohito's death, however the Takeda family were still in absolute control and the Japanese invasion of Britain commenced. When the Japanese invasion started, on Christmas Day, the British armed forces were decimated, what remained came under the control of the Guardians, and the fightback commenced.
The long standing British allies, the Americans, were powerless to provide help, as the Japanese had positioned one of their nuclear submarines off the North American coast, and threatened the United States Government with attack by nuclear tipped missiles should they act.