The members of the student council of Hekiyou Academy are chosen by a popularity vote. As a result, all the members are cute girls except for Sugizaki Ken, who studied hard to enter the council. This novel is about the endless chatters of the members, full of parodies from various other works such as "The Melancholy of Haruhi Suzumiya", "Dragon Ball" etc. 
The series was originally planned to be titled as "Hekiyou Academy Student Council's Minutes (&#30887;&#38525;&#23398;&#22290;&#29983;&#24466;&#20250;&#35696;&#20107;&#37682;, Hekiyou Gakuen Seitokai Gijiroku), but because of the length, the title of the first volume "Seitokai no Ichizon" was chosen to refer to the whole series. It is also called "Seitokai Series" by some.

The members of the student council of Hekiyou Gakuen are chosen by a popularity vote. As a result, all the members are cute girls except for Sugisaki Ken, who studied hard to enter the council. The story features the endless chattering of the members full of parodies of "The Melancholy of Haruhi Suzumiya", "Dragon Ball", "Death Note", etc. 

Sugisaki Ken, through diligence and academic excellence, had successfully entered the paradise that is the Hekiyou Private Academy's Student Council. There, he boldly embarks on his plan to create his personal harem with the 4 girls who are the other council members, namely: The incredibly youthful president Sakurano Kurimu; The cool and kindly yet super-sadistic secretary Akaba Chizuru; Tomboyish and hot-blooded vice-president Shiina Minatsu; and The ephemerally beautiful yet complicated treasurer Shiina Mafuyu. While every day since then has been non-stop fun, Graduation Day now looms near. Could this spell the end of their carefree days? 
(Source: translated and adapted from official site by Cranston)

This casual school story features a student council made up of beautiful girls elected through a popularity contest and one boy!
 
The student council of Hekiyo Private Academy is chosen not through a normal election but through a popularity contest. Ken Sugisaki is the one student who managed to join the council through his good grades, and his wish is to create a harem! A casual school story about a very casual student council.
 
(Source: BookWalker)

The adventures of Hekiyou Gakuen's student council in a super-deformed 4koma style.

Spin-off series for the Seitokai light novel series.

The characters from both Haganai and Seitokai no Ichizon visit each others' clubroom in this two-part crossover. Strangely enough, the male protagonists from each manga do not make appearances. 
Chapter One: 
The Neighbor's Club gets a mysterious message from a certain student council! This chapter was drawn by Itachi, the artist of the Haganai manga. 
Chapter Two: 
The Hekiyou Gakuen student council receives an invitation from the Neighbor's Club to visit. This chapter was drawn by 10mo, the artist of the Seitokai no Ichizon manga.

Tags