Who were the ultra-nationalists in Japan? What did they want?

Uyoku dantai  are Japanese ultranationalist far-right groups.

Most, but not all, seek to justify Japan's role in the Second World War to varying degrees, deny the war crimes committed by the military during the pre-1945 Shōwa period and are critical of what they see as a "masochistic" bias in post-war historical education. Thus, they do not recognize the legality of the International Military Tribunal for the Far East or other allied tribunals and consider the war-criminals enshrined in the Yasukuni Shrine as "Martyrs of Shōwa". They support the censorship of history textbooks, or historical negationism.

Explanation:

detente translated to english means politics