Saikin, Imouto no Yousu ga Chotto Okashiinda ga. OVA

最近、妹のようすがちょっとおかしいんだが。 OVA

Jun 30, 2014 Finished Airing ★ 6.44

1 sub eps

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)