Black Belt
黒帯 (original)
Set in 1932, amid the rise of militarism after the establishment of the Manchukuo colony in Northeast China, the story centers on a trio of karateka. Studying under their aging master in a small dojo in the woods of central Kyushu, Choei, Taikan and Giryu face a company of kempeitai military police come to requisition their dojo for use as a military base.
Starring Akihito Yagi, Tatsuya Naka, Yuji Suzuki, Arashi Fukasawa, Hakuryû, Hakuryu, Takayasu Komiya, Yōsuke Natsuki, Shin'ya Ohwada, Kenji Anan
Watch "Black Belt" from streaming services Amazon Prime, Tubi TV released in 2007. It's a action & adventure and drama movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.