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Watching Order (by release date)
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Ore no Imouto ga Konnani Kawaii Wake ga Nai centers around Kyousuke, a seemingly ordinary high school student, who discovers a surprising secret about his seemingly perfect younger sister, Kirino.
Kirino, a popular model and excellent student, is secretly a hardcore otaku with a passion for eroge (adult-oriented video games) and anime.
To protect her reputation, Kirino enlists Kyousuke's help in navigating her hidden hobby.
As Kyousuke gets drawn into Kirino's otaku world, he meets other unique individuals with similar interests, like Ruri and Saori, leading him to experience a completely new and unexpected side of life.
The anime explores the challenges of keeping Kirino's secret safe and the changing dynamics of their sibling relationship as Kyousuke becomes more involved in her private world.