Saikin, Imouto no Yousu ga Chotto Okashiinda ga. OVA
Japanese title: 最近、妹のようすがちょっとおかしいんだが。 OVA
Type: OVA
Episodes: 1
Source: Manga
Genres: Comedy, Romance, Supernatural, Ecchi
Studios: Project No.9
Duration: 23 min
Rating: PG-13 - Teens 13 or older

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)