Spice and Wolf, Vol. 1 (light novel) — Isuna Hasekura

The life of a traveling merchant is a lonely one, a fact with which Kraft Lawrence is well acquainted. Wandering from town to town with just his horse, cart, and whatever wares have' come his way, the peddler has pretty well settled into his routine -- that is until the night Lawrence finds a wolf goddess asleep in his cart. Taking the form of a fetching girl with wolf ears and a tail, Holo has wearied of tending to harvests in the countryside and strikes up a bargain with the merchant to lend him the cunning of "Holo the Wisewolf" to increase his profits in exchange for taking her along on his travels. What kind of businessman could turn down such an offer? Lawrence soon learns, though, that having an ancient goddess as a traveling companion can be a bit of a mixed blessing. Will this wolf girl turn out to be too wild to tame?