Excellent tonkotsu gyoukai in Ogawamachi. They also have shoyu and miso. Interesting noodle type, extremely wide (pappardelle-size) noodles are available as an option, I strongly recommend. I would stay away from the thin paper-like pork strips with all the white tasteless fat on them as pictured. Slightly cramped shop layout and the man and woman team seem sort of new to the job and rushed. They use Kaikarou noodles as evidenced by the boxes outside the shop. Very tasty.
Walker Plus site