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The People's Democratic Republic of Japan (Japanese: 人民民主共和国, Jinmin minshu kyōwakoku) or North Japan was the Japanese state that existed from 1946 to 1989. After the Soviet victory over the Turkish and German invasion, and the subsequent Soviet conquest of Constantinople and Berlin, the Soviets advanced their conquest into the Japanese Archipelago, invading the northern part in the same fashion as North Korea.
Having already dealt with enough fighting, the Japanese showed no resistance to the Soviet invaders. Afterwards, North Japan became part of the New Comintern, the duo Soviet-Chinese led international communist brotherhood.
The Soviets armed the pro-communist People's Japanese Army, to fight against the pro-western People's National Defense, in which the former ended up victorious. As a result, a communist government was established in northern Japan, which led to a large exodus of Japanese refugees to South Korea.
The division of Japan in this timeline resembles that of the Korean Division, which also happens in this AT.
During the Sino-Soviet Split, the Soviets used the Sino-Japanese enmity to their advantage, in which the Japanese Communist government grew closer to the Soviet Union in pursuit of actions against China.
When Mikhail Gorbachev became leader of the Soviet Union, all of its allies took advantage of his perestroika and glasnost policies, and northern Japan was no different. In northern Japan, anti-communists stormed government buildings, leading to the resignation of the CPJ in 1989, and paving the way for the Japanese Reunification.