Death March to the Parallel World Rhapsody Vol 23
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@Almond-Magnum In the book linked, that was a "side character" Shiina Mitsuya and her "childhood friend" Saburou Yaguruma, as it were. They were primary in that book.
Quoting the afterword of that book:
Saburou and Shiina, the new freshman duo, seem to have taken the hero and heroine positions in both Volume 21 and 22, but they will settle into regular supporting character status from Volume 23 onward. I know. It seems like such a waste.
