Spice and Wolf, Vol. 4 (manga‪)‬

Proud of his skillful transaction in Poroson (with more than a little
help from Holo), Lawrence turns his cart toward Ruvinheigen in hopes of
swelling his profits. Along the way, Lawrence and Holo meet the
shepherdess Norah, whom they engage to "protect" them along the way. As
it turns out, though, it isn't wolves from which Lawrence needs
protection, but his own ambition. The threat of a merchant's worst
nightmare awaits him in Ruvinheigen - bankruptcy!!