Yowai 5000-nen no Souchouku Dragon, or also known as The Weakest Undefeated Bahamut Chronicle, is a Japanese light novel series written by Senri Akatsuki and illustrated by Ayumu Kasuga. The series follows the story of Lux Arcadia, a former prince of the Arcadia Empire, who ran away from his kingdom after a coup d'etat occurred. He then stumbled upon a girl, Lisha, who challenged him to a Drag-Ride duel. Lux defeated her and became her servant/handyman. Together, they attend the Royal Knights Academy and face challenges as they uncover the mysteries of their world.