Why on earth would anyone move to Japan ?
You get treated like shit, get paid shit, do shitty work, and work under morons whose only qualification is the ability to speak Japanese and bullshit in English... and this for Machine Learning. I can't imagine the things one has to put up with for more vanilla jobs.
Moving to Tokyo must be one of the biggest regrets of my life. I'd look for Singapore or India even, compared to 'grorious Nippon'.