After not getting on well with his younger sister for years, she reveals to him that she is secretly an otaku. He decides to be a supportive older brother and starts to find out things he never knew about his sister.
Kyousuke Kousaka is created by Tsukasa Fushimi as a main character in the Oreimo franchise. He has no information regarding any inspiration used to create him. He first makes his debut in the light novel series, volume 1: chapter 1. His manga debut is volume 1: chapter 1 while he makes his anime debut in episode 1. He is voiced by Yuuichi Nakamura.