The Japanese government didn't. If it did, the war would have ended much
sooner. Assuming it did, then Hirohito would have given his surrender speech
back on July 28, 1945, and Japan would have surrendered.
If I read this correctly, you do not have a clue what a what if is, and di not even read the original post.
Now, back to the topic. I wonder whether the Japanese government would do this. The military, at least, seriously believed that they could win a decisive battle in Kyushu when the Americans hit the beaches. They certainly would have tried. Most sources I have seen suggest massive casualties on both sides, but an American victory. They did not know of the Atomic Bomb, ignored the Tokyo firebombing raids, did not believe that they could be starved out (although in hindsight it would be rather easy), and discounted the chances of a Soviet invasion of Manchuria, Korea, and Hokkaido. However, for the sake of this thread, let's assume they come to their senses and do accept the declaration.
Now, this puts the Allies in a bit of a bind. remember, the war in china has always been bitter, and Japan was often seen as the real enemy of the US. On the other hand, this fulfills most of the goals of the allies. I think they accept, and the occupation is similar to OTL.
Now, butterflies. One; the atomic bomb has never been deployed. There will likely be less fear of it, so it is more likely to be employed (it is also more likely to be overlooked by Stalin). Also, since there will be little documentation of the effects of it's radiation for longer, less fear as well. Also, the Soviets have not had time to redeploy their soldiers and launch operation August Storm, so they have less of a hand in Asia. I think Mao eventually falls to Chaing, and the US unites Korea into one republic.