[Just to clarify this is purely a hypothetical, I don't support this blatant act of imperialism.]
By act of ASB/ROB, immediately after Japan's unconditional surrender the plans of the United States government shifts towards outright annexation, with Japan being cut up into american territories with plans for them to be directly brought in as states at some distant point in the future. This is generally supported by the american public (again, ROB/ASBs are involved). The entire imperial family gets exiled to some isolated part of Alaska and barred from returning to Japan ever again.
The mind control of the American government lasts until the mid-80s (or if the United States itself somehow collapses).
So realistically does this just turned into some sort of american version of French Algeria with all that entails? How does the inevitable attempts to "americanized" them effect to japanese as a culture? How bloody and widespread is the inevitable resistance to the occupation likely to be?
How does this likely effect internal american politics and the wider Cold War?