Yamato-Japanese with Distant Ainu heritage.
Yakonid with very slighter admixture of Jomonid, cause he doesn't have the wide broad nose, thick lips, and dark brown skin complexion, as what Jomons, such as Ainus, have.
I say in my estimation, he is 96% Yayoi/Yamato, and 4% Jomon/Ainu, like the typical Hokkaido-Japanese, since the vast majority of Yamato-Japanese are purely Yayoi, and barely have no Indigenous Jomon admixed ancestry.
Jomon admixture is a very small minority in Japan.
Mostly Hokkaidoans, and Okinawans have Jomon admixture(Okinawans have more Jomon blood than Hokkaidoans), while most Central-Japanese don't barely have any.