Kouyouen

Kouyouen (光陽園学院) is a prestigious and well-known school. It has a high university entrance rate.

Taniguchi, a student of North High, claimed he found a girlfriend there in December of year 0, shortly before The Disappearance incident occurred. The student turned out to be Kuyou Suou.

Alternate Academy
In an alternate reality created by Yuki Nagato, the school was co-ed and specifically designated for students with advanced academic abilities. Haruhi Suzumiya and Itsuki Koizumi attended it. The same state of events exists in The Disappearance of Nagato Yuki-chan.

Students

 * Kuyou Suou (data alien)

The Disappearance Alternate Reality

 * Itsuki Koizumi
 * Haruhi Suzumiya

The Disappearance of Nagato Yuki-chan Alternate Reality

 * Itsuki Koizumi
 * Haruhi Suzumiya
 * Sasaki

Trivia

 * Girls in Kouyouen uniforms were seen in the anime episodes The Sigh of Haruhi Suzumiya Part 1 and Someday in the Rain, both times on trains.