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)
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Bokutachi wa Benkyou ga Dekinai!: Chapel no Kane wa [X] wo Shukufuku Suru SUB online, or you can even watch
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