Proof: Ainu can never be Caucasian. Haplogroup D2 is related with Adamanese
https://www.youtube.com/watch?v=uJm86cxWCKA#t=38
According to the Japanese friend of mine.
This video does not shows Jomons and Ainu are same race as Adamanese. It's only saying they share some superficial pseudo-resemblance. The truth is Adamanese, despite their African-Negroid appearance share physical anthropological facial features of the Australoid race rather than Negroid ( more closer to Australian aborigines ).
The Jomon and Ainu share cranial-facial similarity with Caucasians, Australoid, Polynesians, Dravidians but their DNA suggest their pure Mongoloid, including their dental morphology and fingerprint shows they are same race as the Sundadont Mongoloid race of Southeast Asia.
Some Taiwanese aborigines shows more physical resemblance to Polynesians, Caucasians, Australoid are also pure Mongoloid in DNA and are Sundodant race.