Yahari Ore no Seishun Love Come wa Machigatteiru.: Kochira to Shite mo Karera Kanojora no Yukusue ni Sachi Ookaran Koto wo Negawazaru wo Enai.
The Service Club is recruited by a magazine to write an article promoting "Love and Marriage". Yukino calls in Hachiman's younger sister Komachi for assistance, and the three of them, along with Yui and their teacher Shuzuka get side-tracked and begin competing to see who can be the best wife.
(Source: Anime News Network)
Note: Bundled with the limited edition of the Yahari Game demo Ore no Seishun Lovecome wa Machigatteiru. PlayStation Vita game from 5pb.