We Never Learn: BOKUBEN - The Church Bells Bless [X]

Bokutachi wa Benkyou ga Dekinai! Chapel no Kane wa [X] wo Shukufuku Suru

Bundled with the limited edition volume 16. The episode features an original premise where Fumino, Mafuyu, Uruka, Rizu, and Asumi are taking part in a wedding ceremony. (Source: MAL News)