Kame Restaurant

Most likely....visa works in every country I've visited in my experience :)

For that level of detail, you need to call Kame or better still, if your local, stop in after the lunch rush at 1:30 or so. They close in late afternoon to prep for dinner service, so check their hours. My understanding is that Japanese restaurants make rice in large batches so the one thing that might be difficult to vary for individual diners is how the rice is prepared. Kame does offer some items like Maki Mono with brown rice. I have no direct knowlege of their cooking process but they may make the brown rice differently. Lastly, Ming Tsai is a famous Boston-area restauranteur who was v innovative in accommodating diners w food restrictions - mostly allergies, but that can include alcohol. He started something of a movement in such accommodation and his people may know area Japanese restaurants that can meet your friend's dietary requirements. His restaurants are Blue Dragon & ChowStirs. If nothing else they might give you information to help your research.