Saving the Future by Traveling to the Past! Lansen, the last prince of the Banroa Kingdom, which was destroyed by the Empire’s invasion. He departs to a distant foreign land with the children of his retainers, and through his efforts to survive, he becomes a Sword Master at a young age. However, a mysterious events causes him to lose his power, and those around him fall into danger… To survive, he uses an ancient relic to travel 10,000 years into the past, and with the opportunities he gains there, he returns to the present to overcome the crisis. Yet the threats keep repeating, forcing the protagonist to repeatedly travel through time. Amidst it all, astonishing secrets connected to the present begin to unravel, one by one.