* Based on a light novel series of the same name by Fushimi Tsukasa, illustrated by Kanzaki Hiro.

Kousaka Kyousuke, a normal seventeen-year-old high school student, has not gotten along with his fourteen-year-old sister, Kirino, in years. For longer than he can remember, Kirino has ignored him entirely and even abused him. It seemed their relationship would continue this way forever.

In what might have otherwise been just another day, however, he happens to find a DVD case for a mahou shoujo anime by the title of Hoshikuzu Witch Meruru (Stardust Witch Meruru) in his house's entranceway. He mentally inspects every member of his household as potential owners, but discards everyone as impossible cases. Upon carelessly checking the case contents, he is startled to find inside the case not the corresponding DVD, but instead an adult game called Imouto to Koi Shiyo! (Make Love with Little Sister!). Determined to find out the owner of the goods, Kyousuke brings Meruru up at the family dinner table in a roundabout manner. His parents react very negatively towards the subject, especially his father, a policeman with a firm personality and a prejudice against anime fans. Kirino, on the other hand, abruptly ends her meal and disappears into her bedroom. Concluding the box could only be hers, Kyousuke decides to bring the truth out of her.

In the dead of the night, Kirino violently wakes her brother up to talk to him, a completely unprecedented event. She drags him into her room and shows him a massive collection of cute girl-centered anime, manga and visual novels, a large share of which are adult games featuring young girls acting cute towards fictional older brothers, who are in fact the player. Kyousuke is taken aback, but now that Kirino has shared her secret with him, he is part of it, and there is no going back. He is about to be forcefully dragged into his sister's life, in a way he certainly neither expected nor would have chosen had he been given the chance.

— written by Hinoe

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Other: Nexus
Sequel: Ore no Imouto ga Konna ni Kawaii Wake ga Nai.
Same setting: Eromanga-sensei