Try soba here and there and everywhere, it’s food that you can take a risk given the ingredients are safe enough.

Okina

B1F, Five Annex,
1-3-10 Ebisunishi,
Shibuya-ku, Tokyo
03-3477-2648

Kochi

1-21-9 Sangenjaya,
Setagaya-ku, Tokyo
03-3421-5892

Hosokawa

1-6-5 Kamezawa,
Sumida-ku, Tokyo
03-3626-1125