I’ve spent a little time in Japan and have been to the Kerin races a few times. It is almost not bike racing. My Wheaties/Schwinn team mate, Michel Vaarten, from Belgium, was World Champion, back in the 80’s. He’d go over to Japan in early spring in super form and come back a couple months later completely unfit. They sequester the riders to keep them away from the betting public.
Anyway, here is a short video about Kerin racing. I especially like it, early, when one of the riders puts a pack of cigarettes down as he is suiting up. And of course, the ending music of Old Oak Tree.