how the number of POWS the Japanese took compared to that of the Russians? and how compared to the Germans?
where they sent them mostly and to do what and when released? how many released in comparison to the Russians and Germans?
Japanese believed that anyone that surrenders is a coward. They treated prisoners harshly and did force them to work. There was no gulag system, but there were camps set up.
Read about the Bataan Death March where they forced American and Filipino soldiers to march a long distance to a set up camp in Bataan peninsula in the Philippines. They gave them no food, water, or rest. Japanese soldiers beat the prisoners brutally and executed any that fell down or was slowing up the line.