Where can I find authentic Japanese restaurants owned by Japanese immigrants?

Hello,

I recently went to a delicious Korean restaurant owned by an elderly Korean man. Most of the customers there were Korean. The food tasted amazing.

I noticed that I’ve never experienced this for Japanese restaurants. Are there any places in the Chicago area where you will hear a lot of Japanese being spoken? I feel that all of the sushi and ramen places I’ve been to are very Americanized. Where do Japanese people go for authentic food?

ありがとう　(thanks)