Lux, a former prince of an empire named Arcadia that was overthrown via a rebellion five years earlier, accidentally trespasses in a female dormitory's bathing area, sees the kingdom's new princess Lisesharte naked, incurring her wrath. Lisesharte then challenges Lux to a Drag-Ride duel. Drag-Rides are ancient armored mechanical weapons that have been excavated from ruins all around the world. Lux used to be called the strongest Drag-Knight, but now he's known as the "undefeated weakest" Drag-Knight because he will absolutely not attack in battle. After his duel with Lisesharte, Lux ends up attending the female-only academy that trains royals to be Drag-Knights.

"Alpha Stigma" are known to be eyes that can analyze all types of magic. However, they are more infamously known as cursed eyes that can only bring destruction and death to others. Ryner Lute, a talented mage and also an Alpha Stigma bearer, was once a student of the Roland Empire's Magician Academy, an elite school dedicated to training magicians for military purposes.