Rinki Ramen in Kumamoto serves tonkotsu ramen and sits in an alley that feels like a market. The tonkotsu broth is clean, the meat is smoky, and a version with more meat can be ordered. A cat is visible in front of the entrance while you wait, and the shop runs like a one-person operation, so orders take time and there is a wait. Access to the location is not good for tourists.