The Great Shaku Hunter, a 20 minute watch from Rolf Nylinder is absolutely stellar. (And if you can stream it to a full-sized screen, do yourself a favor and enjoy it in that fashion).
Forget the fact that I enjoy tenkara which is of Japanese origin, this video has zero tenkara in it, rather focuses on a small group of Japanese fly anglers who target native trout, the iwana & yamame, in excess of 30.3cm... or "shaku" sized.
It's much more than that though, I'd highly recommend you carve out some time and give it a watch. Superior storytelling is so rare in the world of fly fishing films these days, and this video combines a compelling narrative with beautiful camerawork extremely well.
In addition, there's much more to be learned about Shaku Hunters HERE.