In a forgotten continent, five people embark on an adventure based on a ridiculous suicide note. On the way to pursue treasures and the truth, they broke into strange city-states, traveled through dangerous secrets, and dealt with powerful enemies from all walks of life, gradually uncovering the deep secrets of the world. Along with thrilling twists and turns and laughter and friendship, they grow from a group of transparent little ones into heroes who save the world. They gain healing and growth, and finally overcome the desperate situation with wisdom and humor. Each volume revolves around a higher-level mystery, which is both relatively independent and interlocking, with the final climax ushering in the victory of all members and the rebirth of the world.