Ramen is becoming more expensive here too, as prices are going up in Japan. 😂
I don't know much about ramen restaurants in Tokyo, but Ichiran(一蘭) is one of the best and most famous in Japan. It is not only in Tokyo, but all over Japan, near my house and even in foreign countries. There is always a line of people waiting in line.
https://en.ichiran.com/shop/area-oversea.html