Even on a weekday, there's a queue at Tokyo's vegan Izakaya Masaka, including many tourists eager to try meat-free versions of Japanese classics like fried chicken and juicy dumplings.

While millions of visitors have happily savoured Japan's fish- and meat-heavy cuisine, options for vegetarians and vegans are harder to find.

Now, Tokyo and other cities are on a mission to show the country's renowned gastronomy is not off-limits to those who don't eat meat.