I've been living in Japan for a few years and I've tasted many different styles of ramen in different places. In my opinion, this was the tastiest so far! Give it a shot if you ever go to Kumamoto.
I’m not as familiar with the regional variations of ramen! This looks delicious. Mind sharing what some of the distinctions of it are compared to other tonkotsu-style broths?
I think the biggest distinction is that in addition to pork bones, they also add chicken bones and vegetables to the broth to make it richer. Also, they add pepper oil and garlic as topping. The raw egg yolks are not part of the style, they're an "unorthodox" (because it deviates from the traditional style), but delicious addition by the restaurant.