Hi!

I am glad that you are asking that question before you go to Japan, as I would also be concerned with some of your allergies.

If it has not yet been done, it would be a good idea to print your allergies in English and in Japanese so that restaurant staff can use it as a checklist. I work in the restaurant business and it always is appreciated, especially when it is multiple allergy like yours.

I would not be concerned with the social aspect of the allergies as they are becoming more rampant, even in Japan. Presenting the list of items would shorten the explanation time, but if the others want a challenge, and they want still to invite you, why not?

Allergy to soy includes the sauce, I presume. this is tricky as it is all over the place, and accidental contact may occur as well. tons of people are lactose intolerant, as well as having seafood allergies.

Good luck!