[blimp]

if you are not a japanese citizen or have a P.R your spouse will unfortunately only be able to get a dependent visa through you. she may still theoretically be able to get a work visa herself, although based on what you written i would say that seems difficult. the exception might be if you can get a visa based upon japanese heritage. that visa status i don't know too well.

as a dependent i believe you are still able to work, however only 28h a month and for this you need an extra permit.