Saikin, Imouto no Yousu ga Chotto Okashiinda ga. OVA
Genres: Comedy, Romance, Supernatural, Ecchi
Type: OVA, Episodes: 1
Aired: Jun 30, 2014
Studio: Project No.9
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
This OVA is divided into two parts. First one is about Torii Shoutarou following his younger sister on a date. Second one is about Christmas Eve, which Mitsuki, Yuuya and their friends spend at Kanzaki's house.

Bundled with the limited-edition volume 7 of the manga.

(Source: AniDB)