Pia Carrot e Youkoso!!
English name: Welcome to Pia Carrot
Genres: Comedy, Hentai
Type: OVA, Episodes: 3
Aired: Oct 24, 1997 to Apr 24, 1998
Studio: Triple X
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Yusuke Kinoshita is forced by his father to work at his restaurant Pia Carrot all summer due to his bad grades in school. What first seems to be a boring job becomes a memorable experience due to his interactions with his co-workers and his boss. 

(Source: ANN)