Some sushi rice is gluten free, some is not you will have to enquire inside. Sashimi is so that will be OK. Soy sauce is not gluten free, ask for tamari sauce which is similar but gluten free.
Sushi rice is gluten free. I am pretty sure you need to avoid the sauces and wasabi. Also the tempura would be an issue.
Cannot tell you what is in rice. But they have all kinds of sashimi. That is gluten free for sure. So yes.
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