The Idiot
白痴 (original)
In post-World War II Japan, childlike veteran Kinji suffers from post-traumatic stress-induced seizures, and, after treatment at a mental health institution in Okinawa, he returns to his hometown. There he meets and becomes romantically caught up with two women -- Taeko and Ayako. Another man, Denkichi, is passionately in love with Taeko, too. So when Kinji begins favoring Taeko, a violent conflict erupts between the two men.
Starring Setsuko Hara, Masayuki Mori, Toshiro Mifune, Toshirō Mifune, Yoshiko Kuga, Takashi Shimura, Chieko Higashiyama, Eijirō Yanagi, Minoru Chiaki, Noriko Sengoku
Watch "The Idiot" from streaming services Criterion Channel, filmboxlive (Prime) released in 1951. It's a drama and romance movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.