Do I have to go to Japan as a husband and wife for visa travel?

It depends on whether you two have been to any Schengen countries before. Those who have been there don't need a face-to-face sign. If you haven't been there, it should be an interview in theory, but it also depends on the visa officer's idea. Sometimes you just sign in person, but in any case, it seems that all visa applications from Schengen countries must be submitted to the planned embassy or consulate in person.