[saalweachter]

While the Potsdam Declaration called upon Japan to surrender unconditionally, it did, in fact, lay out the conditions for the surrender, including that the armed forces of Japan would be permitted to disarm and return home, they would retain sovereignty of their four principal islands, and that the Japanese people would not be enslaved or destroyed as a nation.

After the atomic bombings -- and the Soviet advance -- Japan accepted these conditions, unconditionally, instead of holding out for better terms, like retaining conquered territory.

(Edit: Now, if you want unconditional surrender, the German Instrument of Surrender, now there's an unconditional surrender.)