While previous answers on this topic haven't been as in depth or well cited as they could be, there is still some info to be gleaned from these threads on Nazi racial views and their alliance with Imperial Japan:

• what were the nazi plans with japan if they had won the war? japanese are pretty far from aryans, were there any plans on how to deal with them (and other non desirable races around the world) if germany won the war? - 280 comments, over 1 year old.

• This thread explores both Nazi racial views of the Japanese and to a lesser extent Japanese views on race though it wildly diverges into off-topic matters and speculation deeper in the thread.

• Why were the German's and Japanese allies in WW2? Was there any mutual benefit? - 3 comments, over 10 months old.

• Despite its short length, the commenter here summarizes the military and political relations between Imperial Japan and Nazi Germany and a small amount about how racial views affected the relationship.