Media

Light novels

Oreimo began as a light novel series written by Tsukasa Fushimi, with illustrations provided by Hiro Kanzaki. ASCII Media Works published 12 novels under their Dengeki Bunko imprint between August 10, 2008 and June 7, 2013.

Manga

A manga adaptation based on the light novels drawn by Sakura Ikeda was serialized in ASCII Media Works' magazine Dengeki G's Magazine between the March 2009 and May 2011 issues. Four tankōbon volumes were released on ASCII Media Works' Dengeki Comics imprint between October 27, 2009 and April 27, 2011. The third volume was released in regular and special editions; the special edition came bundled with an Ayase Aragaki figurine. The manga has been licensed in North America by Dark Horse Comics. A follow-up manga, Ore no Kōhai ga Konna ni Kawaii Wake ga Nai (俺の後輩がこんなに可愛いわけがない?, lit. My Junior Can't Be This Cute), began serialization in the July 2011 issue of Dengeki G's Magazine and features Ruri 'Kuroneko' Goko as the main protagonist. The manga ended serialization in the magazine's May 2014 issue and was transferred to Dengeki G's Comic starting with the June 2014 issue. The first volume was released on May 26, 2012, in regular and special editions; the special edition came bundled with a Kuroneko figurine. As of January 27, 2014, there have been four volumes released.

Drama CD and radio shows

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 Kyosuke. An Internet radio show titled Ore no Imōto ga (Radio de mo) Konna ni Kawaii Wake ga Nai (俺の妹が(ラジオでも)こんなに可愛いわけがない?) to promote the anime adaptation streamed 24 episodes between August 13, 2010 and July 22, 2011 via the official website of the anime. The show was hosted by Ayana Taketatsu, who plays Kirino in the anime, and Kana Hanazawa, who plays Kuroneko. A second Internet radio show to promote the second season of the anime started on April 11, 2013. The show is again hosted by Taketatsu and Hanazawa. Even though the show is limited to a Japanese speaking audience, the e-mail or comments from fans outside Japan will be accepted and sometimes read during the show, and the official website of the show has been translated into English.

Anime

See also: List of Oreimo episodes

A 12-episode anime adaptation produced by AIC and directed by Hiroyuki Kanbe aired in Japan between October 3 and December 19, 2010. The series was released over eight BD/DVD compilation volumes, with two episodes each, between December 22, 2010 and July 27, 2011. Four original net animation episodes were streamed through the official website, as well as several other websites such as Nico Nico Douga, Showtime Japan, and MovieGate, which began on February 22, 2011. The first two were released on June 27, 2011 in the seventh BD/DVD volume and the second two were released on July 27, 2011 in the eighth. These episodes feature a break in the original story arc starting at episode 12 and offer an alternate ending from the TV broadcast. The anime retains the voice cast from the drama CD. The opening theme for the anime is "Irony" by ClariS and composed by Kz of Livetune, while each episode features a different ending theme sung by one of the voice actors. The music of the anime is composed by Satoru Kōsaki and a soundtrack was released on January 12, 2011. Aniplex of America began streaming and simulcasting the series in North America through Anime News Network (ANN), but security issues involving the illegal leaking of episode two online resulted in the stream being placed on hold. The stream of Oreimo returned to ANN with the first four episodes on November 8, 2010. Aniplex of America released the series on an English-subtitled DVD box set in October 2011.

A 13-episode second anime season, titled 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。?, with a period at the end) and produced by A-1 Pictures, aired between April 7 and June 30, 2013 and was simulcast by Crunchyroll. An additional three episodes were screened at Otakon 2013 on August 9, 2013, and then streamed worldwide on August 18. The episodes were simulcast by Crunchyroll at the same time as the Japanese broadcast and were available until August 31, 2013. Despite the change in animation studio from the first season, the second season has the same staff as the first season. The opening theme is "Reunion" by ClariS, while a contest was held for the second season's ending themes. This series has also been licensed by Aniplex of America. A-1 Pictures collaborated with Chiba Urban Monorail to promote the second season by making an Oreimo-themed monorail train, which remained in operation until September 30, 2013. In addition to decorating the exterior of the train, the anime characters were featured in in-train advertising to provide passengers with helpful tips about local sightseeing facilities and shops.

Video games

A PlayStation Portable visual novel titled Ore no Imōto ga Konna ni Kawaii Wake ga Nai Portable was developed by Bandai Namco Games and released on January 27, 2011. The limited edition bundle included an OAD, a sister-talk bonus CD, and an additional game for the PSP. A fighting game titled Shin Imōto Taisen Siscalypse (真妹大戦シスカリプス?, lit. True Little Sister War Siscalypse), based on the fictional game in the series, was released by Kadokawa Contents Gate on the Yahoo! MobaGe Service on January 20, 2011. A second PSP title, Ore no Imōto ga Konna ni Kawaii Wake ga Nai Portable ga Tsuzuku Wake ga Nai (俺の妹がこんなに可愛いわけがない ポータブルが続くわけがない?, lit. There's No Way "My Little Sister Can't Be This Cute Portable" Could Continue), was released on May 17, 2012. The opening theme of the second PSP game is "Nexus" by ClariS. A PlayStation 3 game, Ore no Imōto ga Konna ni Kawaii Wake ga Nai Happy End (俺の妹がこんなに可愛いわけがない。 ハッピーエンド?), was released on September 26, 2013 in Japan. Kirino also makes a cameo appearance in the A Certain Magical Index PSP game, being another game based on a light novel series published by ASCII Media Works. Kirino will also appear as a playable character in Dengeki Bunko: Fighting Climax, with Kuroneko as a support character.