Yes: the "Nuremburg East" trials were held at Sugamo, a prison in Tokyo. The perps cited in this story were apparently some who were missed.
The difference between Germany and Japan was that Germany was overrun and many documents captured which helped track down war criminals. Japan was occupied peacefully and the Japanese had plenty of time to hide or destroy documents, give false identities to wanted criminals, etc. Their favorite excuse when asked for records was that they were burned in the American bombings.
I also think that some deals were done to get the emperor’s cooperation which spared some high ranking imperial relatives with dirty hands. Read “The Imperial Conspiracy”