Ruby Island is a sustainable kingdom founded by the legendary Rose Pirates after generations of war . a curious feline cub named Anchor Rose, longs to explore the world beyond the castle walls. His curiosity leads him to the forbidden Devil's Mouth, where an ancient luminous being tells him that his destiny carries the burden of the world. After surviving the encounter , strange abilities awaken within him, and a mysterious traveler offers him a path toward answers hidden beyond a magical runic door where his true adventures began.