They're already there, Specifically in Tokyo and Osaka. Leftist foreigners organized the BLM rally last year and just had a LGBT march and BLM march last week in Tokya with around 2-3k people showing up, granted 95% were foreigners but the % of Japanese grew somewhat since the BLM rally last year......Only saving grace is the majority of young Japanese people who voted, voted for the LDP their right wing party. Though it looks grim for LDP due to covid and Suga getting shit on for slow vaccine rollouts after Abe resigned to to ulcerative colitis complications.