Role of American censorship ?
I note from the different commentaries : The movie is very short... It is a samurai movie with no swordplay... It was released only in 1952... Well, if I'm not mistaken, in 1945 for a Japanese movie to be made as well as to be released, it needed first to be approved by the American authorities, those well-known specialists in Japanese filmmaking. (And before 1945, by Japan's ultranationalist censorship : same (beep), different day ?).
So, I would not be surprised to learn that the very short duration time (approx. 60 minutes), the absence of sword action and (last but not least) the very late release in 1952 of this 1945 film might be explained by the deeds of some U.S. Army committee in charge of telling Akira Kurosawa how to make movies.