Dio finds Couleur one day while wandering in the hills, taking her home for Mell to keep as a pet. Soon afterward, the children begin the Ordeal of Spirits (せいれいのしれん Seirei no Shiren?) initiated by Norn, a spiritual being who wishes to test their inner nature, and how the condition of being raised by a different family will alter their behavior and actions. As the children's personalities and attitudes shift based what they recall of the values learned from their foster parent on Aselia, Couleur proves to be influenced by their actions, allowing her to shift between three evolutionary branches as she grows in experience, altering her abilities and stat progression. For example, when Dio discovers that he had broken a flower pot in which Mell was growing a plant, he has the option to blame Couleur for the action, which increases Dio's affinity for a dark personality. In turn, this makes it more likely for Couleur to become wild.