Kono Naka ni Hitori, Imouto ga Iru!: Ani, Imouto, Koibito
Japanese title: この中に1人、妹がいる！兄、妹、恋人
Type: OVA
Episodes: 1
Source: Light novel
Genres: Comedy, Romance, Ecchi
Studios: Studio Gokumi
Producers: Lantis, TBS, DAX Production
Duration: 23 min
Rating: PG-13 - Teens 13 or older

Unaired 13th episode of the TV series.