This is a top of top soba restaurant, Sango-an in Shirogane. Even listed in Micheline, lunch cost you from 800
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The best kushiyaki @ Shinagawa st. is Marumiya in Shuwa bldg. 2 min from Takanawa exit by only ¥3,000
However l rather go to Muho in Shirogane-Takanawa for Soba restaurant
You don’t need to buy expensive SAKE. Komedake-no-Sake 800yen/2L is adorable enough.
If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.