The girl who King of Light Iris helped on the way. She and Iris travelled around the world to help people after the protagonist (Prince of Darkness) get berserk.Then Iris brought her to the past to help Prince of Darkness defeat Ingram and prevent him from berserk. Now she is the adventurer go around the world.
Shironeko Project ZERO CHRONICLE
In a world consisting of numerous isles, a young hero from the Astora Isle encounters the adventurer Kyle and follows him on an expedition on the isle. They meet a mysterious girl named Iris and a talking white cat, and together they make their way to the isle's ruins, where they find a flying island. Kyle becomes consumed by darkness there, and the party resolves to travel to the ends of the world on the flying island in order to find the seven "Great Runes," following Kyle's words before he disappeared. (Source: Wikipedia)
