Oniisama E by Ikeda Riyoko — Completed

Untitled

A classic manga about girls at a private all-girls school. The storyline centers around the experiences of Nanako, a "normal" girl who is invited to join the prestigious school organization, the Sorority, and is resented by all the other students because she doesn't appear to be qualified. Other key characters are Nanako's two friends: Tomoko, her friend since childhood who is alienated by Nanako's decision to try to join the Sorority, and Mariko, a strange, obsessive girl who is invited to join the Sorority along with Nanako; her "older brother," Henmi, who she corresponds with by mail; and the "Three Magnificent Ones," all of whom are admired and quasi-worshipped by the rest of the student body: the head of the Sorority, Miya-sama, the haunted, pill-popping rebel, Saint-Just, and the star athlete with a mysterious disease who doesn't like the Sorority, Kaoru no Kimi.

Volume 1
Chapter 1 released Jun 10 '03
Chapter 2 released Aug 22 '03
Chapter 3 released Sep 28 '03
Chapter 4 released Jan 6 '05
Chapter 5 released Jun 25 '05
Chapter 6 released Jul 14 '05
Chapter 7 released Aug 23 '05
Chapter 8 released Oct 9 '06
Volume 2
Chapter 9 released Dec 20 '06
Chapter 10 released Dec 11 '07
Chapter 11 released Jun 26 '08
Chapter 12 released Sep 30 '08
Chapter 13 released Jan 11 '09
Volume 3
Chapter 14 released Mar 26 '09
Chapter 15 released Mar 26 '09
Chapter 16 released Jun 1 '09
Chapter 17 released Jun 1 '09