Nogizaka Haruka no Himitsu

is a Japanese light novel series by Yusaku Igarashi, with illustrations by Shaa. The series originally started serialization in MediaWorks' now-defunct light novel magazine Dengeki hp on June 18, 2004. The first novel was released in October 2004, and is published by ASCII Media Works under their Dengeki Bunko imprint.

Synopsis
Hakujo Academy is a private high school with a student body filled with elite students. At the top of this list is the beautiful Haruka Nogizaka, an intelligent and wealthy girl who comes from a prestigious family, and is by far the most idolized girl at school. Her popularity is so great that her classmates occasionally give her French nicknames to further express their infatuation.

Yuuto Ayase is a timid boy who has the unbelievable luck of sitting in class with Haruka every day. Like many others, he admires her from a distance, never even dreaming of approaching her. But with a sudden twist of fate, Yuuto's random visit to the school library brings Haruka's darkest secret to light, one which could potentially destroy her current reputation of elegance. As it turns out, the school's most beloved princess is actually a huge otaku. This revelation marks the beginning of a beautiful friendship between these two classmates.

Characters

 * Haruka Nogizaka
 * Yuuto Ayase
 * Shiina Amamiya
 * Hazuki Sakurazaka
 * Mika Nogizaka
 * Nobunaga Asakura
 * Ruko Ayase
 * Yukari Kamishiro
 * Nanami Nanashiro
 * Gentou Nogizaka
 * Akiho Nogizaka

Manga Volumes
The manga adaptation of the light novel: with art by Yasuhiro Miyama. It was serialised in Dengeki Moeoh and released under the Dengeki Comics imprint from October 2007.

Anime
The anime adaptation of the light novel series was released in 2 seasons and a 4-episode OVA series between 2008 and 2012, produced by diomedea.
 * see: Nogizaka Haruka no Himitsu (Anime)

Related Series

 * Nogizaka Asuka no Himitsu (Sequel)