Maria-sama ga Miteru 3rd
English name: Maria Watches Over Us 3rd
Genres: Drama, Girls Love
Type: OVA, Episodes: 5
Aired: Dec 29, 2006 to Jul 25, 2007
Studio: Studio Deen
Source: Light novel
Rating: PG-13 - Teens 13 or older
Synopsis:
Summer has arrived, and the students of Lillian Girls' Academy are on break! Yumi and Sachiko head out to the Ogasawara family's summer home, but what was supposed to be a relaxing vacation takes a turn for the worse when some of Sachiko's old acquaintances drop by for tea. These rich and snobby debutantes don't think Yumi is worthy of Sachiko's affection and they're out to make this summer one she'll regret.

(Source: RightStuf)