The Chrysanthemum Republic: A Republican Japan

Would be feasible to extinct the Japanese Monarchy after the surrender of the Empire in 1945? What would be the effects a Hirohito abdication, exile or even prision / death in the Post War Japan?

POD after Japanese Surrender in August 1945
 
Not work. Japanese culture and monarchy are too binded together. Soviets migth found People's Republic of Japan though.
 
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