GJ Club (GJ部, Gujjobu, lit. "Good Job Club") is a light novel series written by Shin Araki and illustrated by Aruya. An anime adaptation of it, produced by Dogakobo, aired between January 10 and March 28, 2013, and a special 46-minute-long special was released in May 2014.
Shinomiya Kyōya is forced to become a new member of the GJ-bu (lit. GJ Club), an unidentified club that dwells in a room of the former building of a certain school. There he meets four girls: Mao, Megumi, Shion and Kirara. Time flies with these unique girls around. The series follows the everyday, though unusual, antics of this band of friends.
Official anime website (Japanese)