Hero's Granddaughter and Demon Lord's Daughter

Story:

The former world was shattered by the war between humans and demon-kin. The only surviving royal of the defeated demons is the Demon Lord's daughter, Daqne, who returns to these former demon-controlled lands with bitter memories. There she meets and helps a black-haired girl named Sakurako. But that girl is a descendant of the same hated hero that demolished Daqne's family...!