Kyosuke quickly becomes Kirino's confidant for her secret hobby.
The series then follows Kyosuke's efforts to help his sister to reconcile her personal life with her secret hobbies, while restoring their broken relationship and coming to terms with their true feelings for each other. He has a distant relationship with his sister, and feels that this will never change.
Four additional episodes, which offer a different ending to the broadcast series, were streamed monthly via the official website and other video streaming sites between February and May 2011, before being released on Blu-ray Disc and DVD in June and July 2011.
A 13-episode second anime season produced by A-1 Pictures, titled Ore no Imōto ga Konna ni Kawaii Wake ga Nai.
However, in the Oreimo: Kuroneko spin-off manga, the two wind up together ten years later.She works as a magazine model and later becomes a novelist, the funds from which she uses to support her hobby.Despite her interests, she states she does not know why she started liking eroge and denies having a brother complex.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.