After 'The Great Ruin', an extraordinary worldwide natural phenomenon that happened in 2033, the scarcely left survivors gathered the remaining civilization together and created a small nation named Wonogawa, based on the area famous for hot spring that provided energy and healing power to people. A millennium later, the King of Wonogawa monopolized the former world's information and banned people from excavating the ruins. However, the disappeared archeologist's daughter, Wonoga finds a weathered cell phone from an old stratum and holds doubt against the undisclosed history of Wonogawa...