Very few places were open on this end of year holiday. This place was basically average but was doing a brisk business due to this. The negi chashu ramen was decent, with a Tokyo tonkotsu shoyu broth that was actually a bit weak - they also had shio and tsukemen broth. It's right outside Exit 1 of the Naka-Okachimachi Hibiya line station. They rate 27 on Supleks. There are much better options within < 5 mins walk from here. Very cramped - there wrere people waiting right behind me as I was eating. Only two tables for 4.
Diddlefinger Map (English labels)