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, 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! or “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.
What will Kyousuke do now? Keep Kirino’s secret, or tell the world that his sister isn’t as cute as she appears to be?
Main Characters
Kyousuke Kousaka has a distant relationship with his sister, feeling that this will never change. However, this suddenly changes when he finds one of her adult games and learns that she is an otaku. Through this, he tries to be a supportive older brother while realizing he himself knew very little about his sister, such as being almost flawless at school to working as a model.
Kirino Kousaka is 14 years old, she is mature for her age with a cold personality. She has a strong “little sister” fetish and owns many adult games, which she got a job modeling to pay for. Despite this, she states she does not know why she started liking it, though it is suggested that she has a brother complex and is using the games as a surrogate to this. She often denies such feelings and believes the 2D and 3D worlds should be kept separate.
Daisuke Kousaka is Kirino and Kyousuke’s domineering father. He is a high ranking officer in the police and has a no nonsense policy at home. He does not like the fact that Kirino is a model, but allows her to do so if she does well in school. He is severely against otaku, believing them to be a waste of a life.
Yoshino Kousaka is Kirino and Kyousuke’s loving mother. She is aware of her daughter’s obsession, as she has referred to her as “my otaku daughter”.
Manami Tamura is Kyousuke’s childhood friend who wears glasses. She is described as ‘plain’ and has a crush on Kyousuke.
(俺の妹がこんなに可愛いわけがない)
