Luke is merely a replica of Asch, the real son of Duke Fabre, and Natalia is not a daughter born to the king.  They escaped from their home city as they were accused of being imposters. Meanwhile they find out the  Outer Lands are about to collapse obliterating the entire humankind unless someone stops the vibration of  the planet's core. They first need to overcome their own past before saving the world while Van Grants and his six God-  Generals are going to stand in their way. Great adventures continue through this alternate-reality world of  swords and sorcery on the planet Auldrant.