Install-Language ja-jp -CopyTosettings
Set-WinUILanguageOverride ja-JP
Set-Culture ja-JP
Set-WinHomeLocation -GeoID 122
Set-TimeZone -Id "Tokyo Standard Time"
$mylang = New-WinUserLanguageList ja
Set-WinUserLanguageList $mylang -Force
Set-WinDefaultInputMethodOverride "0411:{03B5835F-F03C-411B-9CE2-AA23E1171E36}{A76C93D9-5523-4E90-AAFA-4DB112F9AC76}"
Set-WinSystemLocale ja-JP
Restart-Computer -Force