Sanma is a fish that glitters like a sword. In Japan, sanma is both extremely popular and reasonably-priced, at around a dollar per fish. Rich in umami-packed fat, sanma is delicious when grilled with just a punch of salt. It's also great as sashimi, in soup, and much more. This time, we visit Kesennuma, a famous sanma port in Tohoku, to learn all about this autumn treat. Why do the Japanese fall prisoner to sanma's charms every fall? Dive in and find out.