The abbot is German, the common language is English and it is a mixed bag of Japanese, Germans and everyone else.
Nice oldschool Soto Zen temple up in Hyogo prefecture on top of a mountain. The air is clean, the rice is full of fiber and minimum four hours of zazen a day not including free days.
This is your best option in all of Japan in my opinion. They also have long sesshins.
Thank you kindly Huseng and everyone else. Antaiji seems absolutely perfect. So much so that I have written to ask to stay. I have much to learn. Most of my experience with Buddhism is from Theravada but then that is why I am seeking to practice more outside of my comfort bubble.