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 Shizuka get side-tracked and begin competing to see who can be the best bride.

Source: ANN

Note: Bundled with the limited edition of the Yahari Game demo Ore no Seishun Lovecome wa Machigatteiru. PlayStation Vita game from 5pb.

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Parent story: Yahari Ore no Seishun Lovecome wa Machigatte Iru.