Wolf & Parchment: New Theory Spice & Wolf, Vol. 11 (light novel) — Isuna Hasekura

Col and Myuri have finally persuaded the Ruvik Alliance and safely brought the astronomer Amaretto back to Duran. Unfortunately, their plans have been completely dashed. Thankfully, Amaretto has given them a single ray of hope: the legend of a bear that brought down the moon to block the old empire's march north. If they can forge a new path to the very heart of the Church, they can save Duran from disgrace and put a knife to the Pope's throat in one fell swoop. Will the legend give them what they need as they set off for the boundary that divides the north and the south?