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.
- Kirino Kousaka
Kyousuke notes that Kirino has been distant from him in the past, but he doesn't ask Kirino, rather he leaves Kirino be. One fateful day, he finds her with her hobby, eroge games. After Kirino's life counseling lessons, Kyousuke helps Kirino find friends who accept her for who she is.