Spice and Wolf (Volume 6) (Light novel) - Isuna Haskura

As Holo and Lawrence begin the final leg of their journey, Lawrence decides to accompany Holo to her ancient home of Yoitsu, if only to forestall their parting just a bit longer. Boarding a ship from the port of Lenos (much to the chagrin of the wisewolf, who is none too fond of water!), the pair's fate becomes entangled with that of a boy named Col, whose tale of his circumstances - combined with the gossip of the sailors - leads to a shocking revelation about Holo's homeland!