Undefeated Bahamut Chronicle
Lux, a former prince of an empire known as Arcadia that had been deposed by a rebellion five years ago, inadvertently trespasses in a female dormitory's bathing area, and as a result, sees the kingdom's new princess Lisesharte naked, which earns him the anger of the princess. After that, Lisesharte issues a challenge to Lux to compete in a drag race. Drag-Rides are ancient armored mechanized weapons that have been uncovered from ruins all around the world. These Drag-Rides have been found to feature mechanical legs. Lux was once known as the most powerful Drag-Knight; however, he is now recognized as the "undefeated weakest" Drag-Knight due to the fact that he will never, ever attack in the heat of combat. Following his battle with Lisesharte, Lux finds himself enrolled in a school for royals that is only open to women and prepares them to become Drag-Knights.