Ore no Imouto ga Konnani Kawaii Wake ga Nai

Kyousuke Kousaka and his younger sister Kirino have barely spoken properly in years. Kirino seems almost impossible to criticize: she earns excellent grades, excels in athletics, and works as a fashion model. Then Kyousuke accidentally discovers that she secretly loves anime and adult computer games, a hobby she has hidden from everyone around her.

Instead of exposing her, Kyousuke becomes the only person Kirino can speak to openly about that side of her life. His reluctant role as her adviser introduces him to fellow fans Saori Makishima and Ruri Gokou, and steadily drags him deeper into a world he never expected to share with his sister. Keeping Kirino's secret soon becomes inseparable from repairing the distance that had grown between them.