[dirtyroboto]

Does your allergy include seaweed?
Have you had a more specific reaction test to find out what type of seafood triggers the reaction.

You should be ok with plain rice, there is allot of that here and also tofu. but as the others point out, some form of seafood is used in most prepared food here. Hamburg steak usually has bonito in the sauce, and any burger chain that sells fish burger will have a degree of cross contimination.