Today, I went to the Hamarikyu Garden to see the peony. On the way back, when I returned to Tsukiji Market, there was an advertisement called "Donmai" on the signboard of the building called "Hamarikyu Park Side Place" about 100m. At that time, I realized that this was a "tasty shop of Sanuki udon" that my friend was talking about, and immediately entered the shop.
Like other udon shops, toppings are abundant, but the difference from other shops is (1) cooked rice. (2) oolong tea and jasmine tea are free. (3) Coffee is free after 1:00 noon, and (4) Wednesday is Lady Day, and sweets are available. (5) Kake udon 250 yen, Sanuki ramen, Japanese soba (350 yen each!) Yes, there is. 
Today, we entered after 1 o'clock, so we enjoyed a free coffee lunch because we entered Kake Udon (400 yen), cooked rice (150 yen), fried white fish (100 yen), and after 1 o'clock. It was 650 yen in total.
The dashi is the life of udon. The broth of Sanuki udon is boiled broth, but it was an exquisite harmony by adding a little kelp and bonito broth purchased at Tsukiji Market. The shop has a tatami room where about 30 people can climb, and small banquets are likely to be held from noon.
By the way, the store name is the same as the store adjacent to the main store in Sakaide City, Kagawa Prefecture, and the store manager told me that it was named "Udon delicious". Business hours are from 11:00 to 16:00. It's not open at night.
Closed on Saturdays, Sundays and public holidays. (As of April 19, 2013)
The shop is located at the back left of the lobby on the 1st floor of Hamarikyu Park Side Place, 5-6-10 Tsukiji, Chuo-ku.
