The Light Choice for a Noodle Lunch at Tokyo Station
This restaurant is part of the Setagaya group, which has locations worldwide. They serve a light, briny shio, or salt broth, made from dried sardines and scallops. Although the original spot is lunchtime only, the location at the Tokyo Ramen Street, a set of Ramen shops in the basement of Tokyo station, is open all day.
Tokyo Ichiban-gai B1, 1-9-1 Marunouchi, Chiyoda-ku.