Ore no Imouto ga Konna ni Kawaii Wake ga Nai

Kyousuke Kousaka, a seventeen-year-old high school student, has had a distant relationship with his younger sister, Kirino, for years. She has consistently ignored him and shown little interest in his presence. One day, he discovers a DVD case for a magical girl anime in the entrance of their home. Inside, he finds a hidden adult video game. When Kyousuke brings up the topic of magical girl anime during dinner, it causes a strong negative reaction from his parents, particularly his father, who is a police officer and anti-otaku. Later that night, Kirino unexpectedly enters Kyousuke's room and tells him they need to talk. She takes him to her room and reveals a large collection of moe anime and bishoujo games she has been keeping secret.