Tales of Phantasia: Narikiri Dungeon

The story begins when the player character finds a pair of twin babies in the light and becoming their adoptive parent. By default, the boy is named Dio, and the girl is named Mell. The story skips ahead thirteen years later. Dio enters with a strange creature that followed him home from the mountains. He and Mell decide to keep it as a pet and name it "Couleur" based on the sound it makes: "krr". However, it turns out to be a shapeshifter who is omen for their future destiny.