Even if Xbox 360 got some attention in Japan, Xbox has never been a successful brand in the home of Nintendo and Sony. Especially not Xbox One, which needed seven and a half years to reach roughly 115,000 sold units. It as often sold as little as below 100 units each week in Japan, which means borderline literally nothing at all.
But recently, Microsoft has often said that Japan is their fastest growing market, and now we've got Famitsu numbers to prove it. It turns out that the same week as Xbox One turned one years old (last week), it reached 116,122 sold units in Japan and passed the lifetime sales of Xbox One.
As a comparison, the original Xbox sold 500,000 units in Japan, which will likely be passed in a few years if Xbox keeps the pace it does now with 3000-4000 Xbox Series S/X sold each week. Xbox 360 sold 1.6 million units in Japan, but to reach this level, the Xbox sales need to ramp up eventually, although for that to happen - the production capacity of the console will need to increase as well (something that is currently hard to considering the semiconductor shortages in the world hitting most manufactures).
It should be noted that Xbox Series S/X is still far behind Switch, which sells somewhere around twenty time as many units in Japan, but also PlayStation 5 selling roughly three times as much in the region.
Thanks John Welfare