Lux walks into a bath scene and accidentally becomes the one guy in a school full of nobles who actually treats them like people instead of conquest prizes. The Drag-Ride battles are visceral enough to carry the weight the story fumbles, and the character interactions have genuine charm when the show stops trying to be clever. This is comfort food for people who want their harem shows to at least pretend the action matters.

Lux was once a prince of the Arcadia Empire, which fell to a rebellion five years ago. He blunders into the bath of a girls' dormitory and sees Lisesharte, the new kingdom's princess, without her clothes. Furious, she challenges him to a duel in Drag-Rides, ancient mechanical dragons dug up from ruins and worn as armored weapons. Lux was once hailed as the strongest Drag-Knight, but because he refuses to attack in battle, he is now called the undefeated weakest. After the duel, he ends up at the Royal Knight Academy, a school for girls where royals train as Drag-Knights, and the events that follow could bring hidden secrets of both royal families to light. The show mixes fantasy mecha action with romance and ecchi comedy.