Was there ever a detail war plan for the Japanese to conquer Australia and New Zealand during WW2?

Answer 1

No. Nor were there any serious plans to invade the USA. The Japanese did send troops to the Aleutian Islands, but that was a bluff.
The fact is that for most of the war the bulk of the Japanese army was tied down in China. Japan was fighting a two front war, and even though the Japanese killed Chinese as fast as they could, it wasn't fast enough.
As for the relative sadism of the Japanese and the Germans, the Germans were worse. The Germans conducted horrible medical experiments on children, something the Japanese never even came close to. Don't get me wrong - the Japanese were extremely brutal and careless of human life, but their primary objective was to have a free hand in Asia, not to establish a master race that required the ethnic cleansing of all of Asia.
As for Hiroshima and Nagasaki, they were practically the only targets left. Tokyo had already been destroyed by firebombing.
As for the US forces in the Pacific theatre being less capable than the forces in the Atlantic, that's a slur on all the brave men who fought against a very stubborn foe.

Answer 2

the main reason became that different than for small naval forces used very reminiscent of our Marine Corps and an exceedingly few eastern military divisions, very nearly each and every of the eastern military became in contact in an exceedingly super and bloody war in China. maximum of what became left of the army became held on the Manchurian border with the U.S. to steer away from the U.S. from grabbing Manchuria. Even after the political reaproachment between Japan and the U.S. in 1940 after the border war, there became no love lost between them or maybe much less have faith. to triumph over the extensive land mass of Australia might prefer the eastern military to launch many divisions to the administration of the army, and the army basically could by no skill look to discover the divisions, the logistical help for those divisions, or the prefer to grant the army administration over what may be an significant factor of their adult adult males and officers. the eastern military and military spent as plenty time battling for administration of the different as they did battling the easily war against the Allies.

Answer 3

detailed.....well,no not in the sense that Sicily and Italy and Normandy and Guam and Saipan and the Philippines were detailed...to the sense that there were THOUSANDS of pages of op orders....

it was more a strategic goal; bomb Darwin flat to deny it's use as a base ( check); invade New Guinea north coast ( check) and set up to take Port Morsebry as a staging area to invade Australia NE coast ( check); invade Solomons to set up a seaplane base at Tulagi and an airstrip at Guadalcanal ( check and check) to cover movement to the south east in the Santa Cruz Islands and maybe even Noumea to cut USA/Australia communications.....and then see where they were at.

Plan stopped dead in New Guinea when MacArthur took the one brigade of Australians and the one brigade of Americans available over the Owen Stanley mountains in New Guinea and threw the Japanese back; the US Navy gave up one of three carriers at Coral Sea to turn back the invasion of Port Morsbry, and then the 1st (Provisional) Division, US Marines landed at Guadalcanal.......