Yet, that was exactly the plan. The plan agreed to at Potsdam was to partition Japan like they had partitioned Germany. The Russians were supposed to get Hokkaido and the northern half of Honshu. The US was only supposed to get the southern half of Honshu and Tokyo would be partitioned like Berlin was.
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So what happened? Well, the Soviets weren't playing nice in Korea and Manchuria, so they weren't invited, and didn't have the naval power to support an occpation, anyway.
The Nationalist Chinese had their own problems and didn't have the money to support an occupation. The British did send some troops, but they were in a big hurry to get out of there.
So the task of rebuilding Japan fell entirely to the US.