Whenever I went to O-temachi, I wanted to try this cafe, but didnt have chance till yesterday.
I went to a seminar site before I went to the office, then it was about lunch time when I left the site, so decided to have lunch here finally!
The name is "Dragonfly Cafe."
I had a sandwich lunch set, which was 1050 yen.
It is pretty good price because the lunch set consists of a bowl of soup, salad, sandwich, dessert and drink! Very good, eh? 
Especially this cafe is located in the middle of Marunouchi. Usually the price is very high.
The taste was OK, not excellent but very satisfying.
Have a pleasant lunch here!