Lux is a former prince of an empire called Arcadia, that was overthrown in a rebellion five years earlier. Lux accidentally stumbles into the bathing area of a female dormitory, sees the princess of the New Kingdom, Lisesharte, naked, and incurs her wrath. Lisesharte then challenges Lux to a Drag-Ride duel. Drag-Rides are ancient armoured mechanical weapons, Machine Dragons, that have been excavated from ancient ruins. Lux used to be called the strongest Drag-Knight, but now he is known as the undefeated weakest Drag-Knight since he will absolutely not attack in battle. After his duel with Lisesharte, Lux ends up attending the female-only Royal Knight Academy that trains royals to be Drag-Knights. Source: ANN Note: The first episode received an early screening at a joint event with Rakudai Kishi no Cavalry on December 20, 2015, at Shinjuku Meiji Yasuda Seimei Hall in Tokyo. The regular TV broadcast started on January 11, 2016.