Engaged to the Unidentified: Mite. Are ga Watashitachi no Tomatteiru Ryokan yo.

Unaired episode included in the special edition of the 5th manga volume.

Not every girl gets what she wants on her 16th birthday, but Kobeni's gift is something she never saw coming: an arranged marriage! Thanks to her late grandfather, Kobeni's been engaged to a total stranger since childhood, and even though she's supposedly met him she doesn't remember a single thing about him. Even weirder is that both her Mom and creepily over-doting sister, Benio, seem completely unsurprised when the groom-to-be, Hakuya, and his younger sister, Mashiro, show up on the family's doorstep to move in with them! But it's not until they start attending Kobeni's school that things take an even stranger turn after she starts to pick up some very... unusual vibes from her potential future family. From Mashiro's obsession with aliens and UMAs (Unidentified Mysterious Animals) to Hakuya's disconcerting lack of emotion, there's something very off about them that Kobeni can't quite put her finger on. What has her grandfather gotten her into, and how does this relate to the strange gap in Kobeni's memory?

The OVA anime release Marriage consists of two 30-minute pieces by Miki Kasamatsu on the topics of love and looking for that special someone. The first deals with a group of young women who, after being out of school for a few years, are beginning to think about settling down. However, there is one member of the group who has no prospects, and Shizuka's friends are worried that her shyness will keep Mr. Right from noticing her beauty and character. They persuade her to join a dating service called The Wedding Club, but when her first match seems to be quite a dud, Shizuka wonders if a trip down the isle just isn't in her future. The second episode is about five sisters, only one of whom isn't married. What's more, the cool Kiyomi seems to have no interest whatsoever in finding a husband. Her sisters have other ideas, though, and when a co-worker asks her out on a date, the women convince the suitor to propose marriage that very night.This is easier said than done, however, as Kiyomi's attitude can be quite intimidating. The young man may not end up following through with the plan, but even if he does there is no guarantee that the headstrong lady in question will say yes.

Special episode of Yuyushiki.