Unlike Las Vegas, a wedding ceremony in Japan does not have any legal ground. You are not legally married until you register your marriage with a local government (if you are a resident in Japan), your embassy or in your home country.
If you are already married in other countries, you can have another wedding ceremony in Tokyo. It can be a great way to reaffirm your marriage bonds for your anniversary. With a touch of a local culture, it will be more unique and memorable.
