If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
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One of best of the best Soba in Tokyo is Komiya 5 min walk from Hamamatsu-cho st. Don’t believe other ranking.
2nd. Best Yakitori (Grilled chicken) at Shinagawa station is Tori-Tetsu in Konan area.
This is a top of top soba restaurant, Sango-an in Shirogane. Even listed in Micheline, lunch cost you from 800
You don’t need to buy expensive SAKE. Komedake-no-Sake 800yen/2L is adorable enough.