Welcome to Pia Carrot
Welcome to Pia Carrot (Pia♥キャロットへようこそ!!, pia♥kyarotto e yōkoso) is a Japanese visual novel series by Cocktail Soft (a part of F&C, later F&C FC02). Anime and manga have been based on the games.
The games are all set around restaurants in the fictional "Pia Carrot" chain, and most of the female characters are waitresses at these restaurants. The individual restaurants in the chain are called "1st", "2nd", etc. A maid cafe named "Pia Carrot" also opened in real life as a cosplay restaurant in Akihabara, Japan.