Microsoft hasn't always reached the sales numbers in Japan with past iterations of the Xbox that it wanted despite the consoles being very popular in other countries. Xbox head Phil Spencer recently admitted to that fact when he posted something on Twitter in response to a fan who asked if Microsoft would try and "conquer Japan" since Sony has said the PS4 is only doing OK in the country.
Spencer answered writing, "We will be in Japan in September. Japan hasn't always been the easiest market for us, will be good to launch and be at Tokyo Game Show." One reason that the Xbox and PS4 haven't been as popular as Microsoft and Sony want in Japan is that there has been a lack of games developed in Japan for the consoles.
Spencer says that won't be the case this time out with the Xbox One because Microsoft has first party games in development in the region. Microsoft sees Japan as a critical market for the Xbox One.