Season 1 12 episodes The Voice of My Unfamiliar Little Sister ~ 1 July 06, 2012 My Sister and the Moonlit Dance ~ 2 July 13, 2012 My Sister's Seduction ~ 3 July 20, 2012 My Sister's Hero Is Her Onii-sama! ~ 4 July 27, 2012 My Little Sister Won't Let Me Sleep ~ 5 August 17, 2012 Season more