Kyousuke Kousaka, a normal seventeen-year-old high school student, hasn't 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 Kyousuke and his sister, now fourteen, would continue this way forever. 
One day, however, Kyousuke finds a DVD case of a magical girl anime entitled Hoshikuzu Witch Merle (Stardust Witch Merle), which had fallen into the entranceway of his house. To Kyousuke's surprise, inside the case is a hidden adult video game titled Imouto to Koishiyo! (Love with Little Sister!). Kyousuke 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 Kyousuke's room and, in perhaps the first conversation she has initiated with him in years, says they "have things to talk about." Kirino brings Kyousuke to her room and shows him an extensive collection of moe anime and lolicon bishoujo games she has been collecting in secret. 
(Source: Wikipedia)

Kyousuke Kousaka, a normal seventeen-year-old high school student, hasn't 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 Kyousuke and his sister, now fourteen, would continue this way forever. 
One day, however, Kyousuke finds a DVD case of a magical girl anime entitled Hoshikuzu Witch Merle (Stardust Witch Merle), which had fallen into the entrance way of his house. To Kyousuke's surprise, inside the case is a hidden adult video game titled Imouto to Koishiyo! (Love with Little Sister!). Kyousuke 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 Kyousuke's room and, in perhaps the first conversation she has initiated with him in years, says they "have things to talk about." Kirino brings Kyousuke to her room and shows him an extensive collection of moe anime and lolicon bishoujo games she has been collecting in secret. 
(Source: Wikipedia)

Kousaka Kyousuke, a normal 17-year-old high school student living in Chiba, 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 Kyousuke and his sister, now fourteen, would continue this way forever. One day however, Kyousuke finds a DVD case of a magical girl anime which had fallen in his house's entrance way. 
 
(Source: Crunchyroll)

The true end arc of Ore no Imouto. These four episodes branch out after the 11th episode of the main TV series and present an alternative version to the end of the TV series. These episodes contrast with the good end arc of the TV series, which was an original ending written for the anime, and instead closely follows the original story from the light novels.

OreKou follows the story of the light novels, set at the time when Kirino Kousaka leaves for America to undergo athletic training. While the OreImo anime series tells the story in Kirino's elder brother Kyousuke's point of view, OreKou focuses on Kuroneko's experiences as Ruri Gokou, a high school freshman who becomes Kyousuke's junior. While Kuroneko struggles in mingling with her new classmates, she tries to sort out her feelings for Kyousuke. 
(Source: OreImo Wikia)
 
Note: Chapter count includes a Chapter Zero prologue and four additional bonus chapters.

Alternative ending where Kyousuke and Ayase end together.
 
Note: Includes 1 extra chapter.

1. Trouble Sisters (Amakusa Tobari) 
2. Colon (Sasakura Ayato) 
3. Itsumo Nakayoshi na Wake mo Nai? (Takahashi Mugi) 
4. Atashi no Tsure ga Konna ni Kawaii Wake ga Nai (Ikeda Sakura) 
5. Nimono no Jubaku (Sasahara Yuuki) 
6. Ore no Imouto ga Aitsu de Aitsu ga Ore no Imouto de (Takei Oki (TIES)) 
7. Cat's Stamp (ReDrop) 
8. Kyousuke to (Kureki Nanatsu) 
9. Ruripani! (Morishima Petit) 
10. AYASE Crisis (Flanbell) 
11. Megane Ko! (Yanagi Takashi) 
12. Ore no Imouto ga Konna ni Kanbyou-shite Kureru Wake ga Nai (Minazuki Tsuyuha) 
13. Glass&#9734;Engine (Uttate)

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