Kagawaichifuku
Fantastic Udon restaurant, could be placed in TOP 5 in Tokyo! If you like Udon in general, you've got to try this one, though their soup stock has a strong "Niboshi" flavor in it, which you might not be a huge fan of (you may like bonito stock better). That being said, I'd strongly recommend it.
My rating: 5.0+ (Awesome!)
Kagawaichifuku
Tabelog | More photos | 03-5577-3644
Address: 1-18-11 Uchikanda, Chiyoda-ku, Tokyo
Access: 5 minutes from Kanda station
Budget: 500 JPY or more
Open: 11:00-20:00
Closed: Sunday, 1st Monday