Mari's just discovered that the whole time I was in Japan, there were gluten-free beers available (dammit).
They're all the "low-malt" beers. Well, "beer-like" drinks, anyway. They're even cheap, running at around a dollar each. She's found three of them on the market so far.
It's nice to know that they're available, but it sure would have been nicer to know during those 35°C summers.