Ganko (Takadanobaba: Ramen)
Open noon-2, 5-9pm. Closed weekends.
Ramen noodles in a classic shio-based soup, topped with pork. The decor is sparse, there are only five seats, and if the soup is less than perfect they don't bother opening for business that day. There's no real sign, just a large bone hung up outside the shop when they're open.
Shinjuku-ku, Nishi-Waseda 3-15-7.