Yuyushiki

The uneventful but subtly humorous daily lives of three girls who have just entered high school. Yuzuko is an intelligent airhead. Yukari is a loopy airhead. Yui is the mature and stable heart of the group. The other two girls depend on Yui, and she adores them in return. Teacher Miss Matsumoto, whom they call "Mother," sets them up in a tiny room with two computers and a whiteboard as the school's Data Processing Club.

Synopsis from Anime News Network