Mitsugimono no Hanayome

Princess Abelia, known as the "Soot-Covered Princess" and ostracized by her stepmother and siblings, is to marry into the neighboring Kingdom of Sable, a country with which Abelia has long been at war. Her betrothed is the new king, Blaze XIV. Although they are supposed to be meeting for the first time, Blaze saves her from danger and says something unexpected: "I've finally got you. Abelia, my bride." Abelia, who has become a "tribute" for peace, and the taciturn new king Blaze overcome various difficulties together and gradually grow closer. (Source: Gentosha, translated)