I’ve gotten exposed to some of these elements of Japanese society through years of anime, manga, and video games, and there’s so many things I’ve done more learning on after finding out about them, but I’ve never thought about looking for movies about them. Ikiru is the only one I can think of that I’ve seen.
All the ones you mentioned sound great, and I’ve just searched for movies about Koreans living in Japan, based on some of the plot points from the Yakuza games that had me interested in their history in Japanese society.
Thank you for opening up a new rabbit hole for me to explore!