Oreimo, short for Ore no Imōto ga Konna ni Kawaii Wake ga Nai, is a Japanese light novel series written by Tsukasa Fushimi. It follows the story of Kyousuke Kousaka, a high school student who discovers that his younger sister, Kirino, is secretly a fan of anime and video games, particularly those featuring eroge (erotic games). The series explores their complex sibling relationship as they navigate the challenges of their interests and societal expectations. Oreimo has been adapted into a successful anime series, manga, and video games, gaining a significant following for its blend of comedy, drama, and otaku culture.