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)
Anix is the best site to watch
Bokutachi wa Benkyou ga Dekinai!: Chapel no Kane wa [X] wo Shukufuku Suru SUB online, or you can even watch
Bokutachi wa Benkyou ga Dekinai!: Chapel no Kane wa [X] wo Shukufuku Suru DUB in HD quality. You can also find
Silver,
Arvo Animation anime on Anix website.