Yup, apparently so. This from wiki is actually quite detailed and mentiones the attempted overthrow of the emperor prior to Japan's surrender:
In early 1945, in the wake of the losses in the
Battle of Leyte, Emperor Hirohito began a series of individual meetings with senior government officials to consider the progress of the war. All but ex-Prime Minister Fumimaro Konoe advised continuing the war. Konoe feared a communist revolution even more than defeat in war and urged a negotiated surrender. In February 1945, during the first private audience with the Emperor he had been allowed in three years,
[41] Konoe advised Hirohito to begin negotiations to end the war. According to Grand Chamberlain
Hisanori Fujita, the Emperor, still looking for a
tennozan (a great victory) in order to provide a stronger bargaining position, firmly rejected Konoe's recommendation.
[42]
With each passing week victory became less likely. In April, the Soviet Union issued notice that it would not renew its neutrality agreement. Japan's ally Germany surrendered in early May 1945. In June, the cabinet reassessed the war strategy, only to decide more firmly than ever on a fight to the last man. This strategy was officially affirmed at a brief Imperial Council meeting, at which, as was normal, the Emperor did not speak.
The following day,
Lord Keeper of the Privy Seal Kōichi Kido prepared a draft document which summarized the hopeless military situation and proposed a negotiated settlement. Extremists in Japan were also calling for a death-before-dishonor mass suicide, modeled on the "
47 Ronin" incident. By mid-June 1945, the cabinet had agreed to approach the Soviet Union to act as a mediator for a negotiated surrender but not before Japan's bargaining position had been improved by repulse of the anticipated Allied invasion of mainland Japan.
On 22 June, the Emperor met with his ministers saying, "I desire that concrete plans to end the war, unhampered by existing policy, be speedily studied and that efforts be made to implement them." The attempt to negotiate a peace via the Soviet Union came to nothing. There was always the threat that extremists would carry out a coup or foment other violence. On 26 July 1945, the Allies issued the
Potsdam Declaration demanding
unconditional surrender. The Japanese government council, the Big Six, considered that option and recommended to the Emperor that it be accepted only if one to four conditions were agreed upon, including a guarantee of the Emperor's continued position in
Japanese society. The Emperor decided not to surrender.
That changed after the
atomic bombings of Hiroshima and Nagasaki and the Soviet declaration of war. On 9 August, Emperor Hirohito told
Kōichi Kido: "The Soviet Union has declared war and today began hostilities against us."
[43] On 10 August, the cabinet drafted an "
Imperial Rescript ending the War" following the Emperor's indications that the declaration did not compromise any demand which prejudiced his prerogatives as a sovereign ruler.
On 12 August 1945, the Emperor informed the imperial family of his decision to surrender. One of his uncles,
Prince Yasuhiko Asaka, asked whether the war would be continued if the
kokutai (national polity) could not be preserved. The Emperor simply replied "Of course."
[44] On 14 August the Suzuki government notified the Allies that it had accepted the
Potsdam Declaration.
On 15 August, a recording of the Emperor's surrender speech (
"Gyokuon-hōsō", literally "Jewel Voice Broadcast") was broadcast over the radio (the first time the Emperor was heard on the radio by the Japanese people) announcing Japan's acceptance of the Potsdam Declaration. During the historic broadcast the Emperor stated: "Moreover, the enemy has begun to employ a new and most cruel bomb, the power of which to do damage is, indeed, incalculable, taking the toll of many innocent lives. Should we continue to fight, not only would it result in an ultimate collapse and obliteration of the Japanese nation, but also it would lead to the total extinction of human civilization." The speech also noted that "the war situation has developed not necessarily to Japan's advantage" and ordered the Japanese to "endure the unendurable." The speech, using formal, archaic Japanese, was not readily understood by many commoners. According to historian Richard Storry in
A History of Modern Japan, the Emperor typically used "a form of language familiar only to the well-educated" and to the more traditional
samurai families.
[45]
A faction of the army opposed to the surrender attempted a
coup d'état on the evening of 14 August, prior to the broadcast. They seized the Imperial Palace (the
Kyūjō incident), but the physical recording of the emperor's speech was hidden and preserved overnight. The coup was crushed by the next morning, and the speech was broadcast.
From here:
Hirohito - Wikipedia