Nogizaka Haruka no Himitsu (乃木坂春香の秘密?, lit.
Haruka Nogizaka's Secret) is a Japanese light novel series by Yūsaku Igarashi, with illustrations by Shaa. The series originally started serialization in volume thirty of MediaWorks' now-defunct light novel magazine
Dengeki hp on June 18, 2004. One more chapter was published until the first bound novel of the series was released, though more chapters were later serialized in the magazine. The first novel was released on October 10, 2004, and as of December 10, 2009, 11 volumes have been published by ASCII Media Works under their Dengeki Bunko imprint. A manga adaptation by Yasuhiro Miyama started serialization in the seinen manga magazine
Dengeki Moeoh on August 26, 2006, also published by ASCII Media Works. An anime adaptation produced by Studio Barcelona aired between July and September 2008; a second anime season started in October 2009. A visual novel for the PlayStation 2 was released in Japan in September 2008.
Nogizaka Haruka no Himitsu is set at the private high school Hakujō Academy in Japan and centers around the male protagonist Yūto Ayase and his classmate Haruka Nogizaka. While Yūto is rather ordinary, Haruka is very attractive, intelligent, and rich. Due to this, she is the school's most unattainable girl and is so idolized that her classmates give her the French nicknames
Nuit Étoile (The Night Star) and
Lumière du Clavier (The Piano's Light). One day, Yūto's good friend Nobunaga Asakura asks him to return a book to the school library, and when he goes to return it, Yūto stumbles across Haruka and her darkest secret—she is a diehard fan of anime, manga, and the otaku culture. Yūto promises to keep her secret hidden and the two become close friends. Yūto does his best to help Haruka with her secret hobby while developing his relationship with her.
The Nogizaka family maid team follows a ranking system. For some unspecified reason (and it seems that the Team are too scared to discuss the topic with Yūto), the second highest ranking maid is missing.
Nogizaka Haruka no Himitsu began as a series of light novels written by Yūsaku Igarashi, and drawn by Shaa. The series originally started serialization in MediaWorks' now-defunct light novel magazine
Dengeki hp with the release of volume 30 on June 18, 2004. A second chapter was published in volume 31 of the same magazine on August 21, 2004. Less than two months later on October 10, 2004, the first bound volume of the series was published by ASCII Media Works under their Dengeki Bunko publishing imprint, and as of December 10, 2009, 11 volumes have been published. Additional chapters have also been published in
Dengeki hp volumes: 34, 35, 41, and 47. The
Mainichi Shimbun reported that as of January 2008, over 700,000 copies of the first seven volumes have been sold.
A manga adaptation started serialization in the Japanese seinen manga magazine
Dengeki Moeoh on August 26, 2006, published by ASCII Media Works. The manga takes its story from the light novels that preceded it, and is illustrated by Yasuhiro Miyama. The first bound volume went on sale on November 15, 2007 under ASCII Media Works' Dengeki Comics imprint; the third volume was published on November 27, 2009.
Source:
Wikipedia 
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