Both last gen and this gen the Joke has been Xbox has no games.
Also there always been a strong National pride for consoles in Japan. The Xbox consoles never sold well there.
In actually the last good Microsoft machines that sold well in Japan was the MSX line of microcomputers, and MS licensed that off to a dozen or so manufacturers to make.
If anything, MS if they want to sell big in Japan needs to take that route again.
Let some Japanese company take over the Xbox brand in Japan.