Dine at the main branch at Dotonbori if you want to get free and unlimited rice refills. There are many branches of them but not all has rice. Add rice to the leftover broth tasted amazing!
Ramon house which open 24/7. All self service so you get to listen to them to call your number. They provide 2 kinds of appetizers and plain rice for free.
Supposedly the most famous ramen shop around. Only has 2 choices of ramen: Char Siu (¥600) & extra Char Siu (¥900). Waiting time was almost 30 minutes & it was mediocre. There are better shops around!