Ore no Imōto ga Konna ni Kawaii Wake ga Nai

Ore no Imōto ga Konna ni Kawaii Wake ga Nai (俺の妹がこんなに可愛いわけがない), also known as Oreimo for short, is a Japanese light novel series written by Tsukasa Fushimi, with illustrations provided by Hiro Kanzaki. The first volume was published by ASCII Media Works under their Dengeki Bunko imprint in August 2008; as of May 2010, six volumes have been released. A manga adaptation drawn by Sakura Ikeda started serialization in the March 2009 issue of ASCII Media Works' Dengeki G's Magazine. An anime adaptation will be produced by AIC.

Plot
Kyōsuke Kōsaka, a normal seventeen-year-old high school student, has not gotten along with his younger sister Kirino in years. For longer than he can remember, Kirino has ignored his comings and goings and looked at him with spurning eyes. It seemed as if the relationship between Kyōsuke and his sister, now fourteen, would continue this way forever. One day however, Kyōsuke finds a DVD case of a magical girl anime entitled Hoshikuzu Witch Meruru (星くず☆うぃっちメルル) which had fallen in his house's entrance way. To Kyōsuke's surprise, inside the case is a hidden adult video game titled Imōto to Koishiyo! (妹と恋しよっ♪). Kyōsuke attempts to fish out the culprit who dropped the case by bringing up the topic of magical girl anime at the family dinner table. All that comes out is a strong negative reaction from his parents, especially his anti-otaku policeman father.

That night, Kirino bursts into Kyōsuke's room and, in perhaps the first conversation she has initiated with him in years, says they "have things to talk about." Kirino brings Kyōsuke to her room and shows him an extensive collection of moe anime and lolicon bishōjo games she has been collecting in secret.

Kōsaka family

 * Kyōsuke Kōsaka (高坂 京介)
 * Kyōsuke is the 17-year-old main character of Oreimo.
 * Kyōsuke is the 17-year-old main character of Oreimo.


 * Kirino Kōsaka (高坂 桐乃)
 * Kirino is Kyōsuke's 14-year-old younger sister. She is very mature for her age with a cold, tsundere-like personality. She has a strong "little sister" fetish and owns many adult games with older brother/little sister themes, which she got a job modeling to pay for. Despite the fact she states she does not know why she started liking it, it is suggested that she has a brother complex and is using the games as a surrogate to this, though often denies such feelings and believes the 2D and 3D world should be kept separate.
 * Kirino is Kyōsuke's 14-year-old younger sister. She is very mature for her age with a cold, tsundere-like personality. She has a strong "little sister" fetish and owns many adult games with older brother/little sister themes, which she got a job modeling to pay for. Despite the fact she states she does not know why she started liking it, it is suggested that she has a brother complex and is using the games as a surrogate to this, though often denies such feelings and believes the 2D and 3D world should be kept separate.

Tamura family

 * Minami Tamura (田村 麻奈実)
 * Minami is Kyōsuke's childhood friend who wears glasses. She is described as 'plain'. She has a crush on Kyōsuke and blushes to his compliments. She becomes comically blind when she is not wearing her glasses.
 * Minami is Kyōsuke's childhood friend who wears glasses. She is described as 'plain'. She has a crush on Kyōsuke and blushes to his compliments. She becomes comically blind when she is not wearing her glasses.


 * Iwao Tamura (田村 いわお)
 * Iwao is Minami's younger brother.

Others

 * Saori Makashima (槇島 沙織) Saori Bajiina


 * Ruri Gokou (五更 瑠璃) Kuroneko (黒猫)

Light novels
Ore no Imōto ga Konna ni Kawaii Wake ga Nai began as a light novel series written by Tsukasa Fushimi, with illustrations provided by Hiro Kanzaki. The first volume was published by ASCII Media Works under their Dengeki Bunko imprint on August 10, 2008; as of May 10, 2010, six volumes have been released.

Manga
A manga adaptation based on the light novels drawn by Sakura Ikeda began serialization in the March 2009 issue of ASCII Media Works' magazine Dengeki G's Magazine sold on January 30, 2009. The first bound volume was released on ASCII Media Works' Dengeki Comics imprint on October 27, 2009.

Drama CD
A drama CD, based on events from the first and third volumes of the novels as well as a newly written scenario by Tsukasa Fushimi, was released by ASCII Media Works on March 31, 2010. The CD stars Ayana Taketatsu as Kirino and Yūichi Nakamura as Kyōsuke.

Anime
An anime adaptation will be produced by AIC and directed by Keiichiro Kawaguchi. The anime retains the voice cast from the drama CD.

Visual novel
A PlayStation Portable visual novel will be developed by Bandai Namco Games.

Reception
The Mainichi Shimbun reported that the fourth volume as the light novel which sold the most copies in August 2009. Anime News Network reported in April 2010 that the first five light novels have sold collectively 920,000 copies in Japan.