There are thirteen episodes in the 2012 anime adaptation of Kono Naka ni Hitori, Imouto ga Iru!, with episode 13 is a special unaired OVA which was released by Japanese production company Media Factory alongside the entire series on DVD and Blu-ray in September 2012.

List of episodes

Episode Name Air date
1 The Voice of My Unfamiliar Little Sister July 6, 2012
2 My Sister and the Moonlit Dance July 13, 2012
3 My Sister's Seduction July 20, 2012
4 My Sister's Hero is Her Big Brother! July 27, 2012
5 My Little Sister Won't Let Me Sleep August 17, 2012
6 My Maid Sisters Have Cat Ears August 24, 2012
7 My Little Sister is Disciplined and Beautiful! August 24, 2012
8 My Sister Resisted August 31, 2012
9 Surprise Attack! Little Sister Warning!! September 7, 2012
10 My Blooming Sisters September 14, 2012
11 My Sister's Trap September 21, 2012
12 My Sister Was Always Beside Me September 28, 2012
OVA Brother, Sister, Lover March 27, 2013

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