Tenrai-ken is a ramen shop near Tokyo Tower and Azabudai Hills that serves miso, shio, and shoyu ramen. The menu includes miso ramen with a thick miso broth, a light salt chicken soba with a mint aroma, and mazesoba. Orders are placed at a vending machine using cash, and staff can assist customers who are not fluent in Japanese. The shop is small, so there can be a wait during meal times.