She may look perfect from the outside, but she has a bad habit of masturbating in school. This is where her true-self was discovered by a guy who had been secretly in love with her. What was shocking is - instead of feeling threaten by the same person, she wants more sex with him! 

Episode 1 & 4: Shigure Chapter 
One day, Kita Komatsu stayed back late to clean the classroom. While he was under the teacher's table, a female student enters the classroom and proceeds to masturbate. While that fact is shocking in itself, Kita Komatsu is even more shocked when he realizes that the female student is student council president Takashima Shigure. She is attractive, excels at both academics and sports, and is looked up upon by both the boys and girls of the school. Kita Komatsu attempts to escape, but he trips and is discovered by Shigure. 
 
Episode 2: Konomi Chapter 
Konomi and her brother are not blood related, but they are as close as any siblings. One night, while having dinner together, Onii-chan's gaze is irresistibly drawn to the two large prominent mounds covered by her sweater. 
 
Episode 3: Miyuki Chapter 
Miyuki has an unspeakable secret: Even at this age, she goes into the bath together with her father. Today, once again, while her mother is out of the house, Miyuki and her father are together. After washing her body, she climbs into the bathtub where her father awaits. As she leans back against his chest, his arms unhesitatingly snakes around to fondle her breast...

1-7. HHH Triple Ecchi ♥ (HHH トリプルエッチ♥ ); Comic Megastore 2008-08, 2008-10, 2008-11, 2008-12, 2009-02, 2009-11, *Toranoana tokuten 
Shigure Takashima is the school princess and is basically a perfect girl from any angle...on the outside. On the inside she enjoys masturbating after school in the empty classrooms, having wild fantasies on "what would happen if someone where to waltz in the room now". Little did she know, that someone was already in that room to begin with. 
The guy in question is a freshman called Kitakomatsu and didn't meant any harm and is perfectly fine with forgetting everything he saw... But Takashima-senpai didn't like that idea... 
8. Peach Temptation (ピーチ てんぷてーしょん); Comic Megastore 2009-04 
A perfectly normal young man is tempted to his limits by the physical charms of a girl he's known all his life. Can he resist? Magic 8-ball says: "Not a chance!" 
9-10. Musume to Chichi no Yakusoku. (娘と父の約束。); Comic Megastore H 2008-05, *Melonbooks gentei shousasshi 
"I think everyone has a secret of their own..." Lovely Miyuki still shares a bath with her father. But this night is different. Tonight Miyuki will keep a promise she made to her father. Tonight there will be nothing in the way... As I thought; I really have a severe father complex, don't I...? 

(*) included in the new edition published on 2017/07/31.

Additional short chapter about the main couple from HHH Triple H.