In Tomioka, Koto Ward, there is a restaurant specializing in gamecock hotpot called Toryori Ariake. They serve mizutaki ramen only during lunch time on weekdays
I had lunch at Jojoen in Kinshicho.
There is currently no Jojoen in Koto Ward.
One of the Jojoen restaurants around Koto Ward has a store near Kinshicho Station.