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You can stream Undefeated Bahamut Chronicle (2016) on HiDive with a subscription.

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.

Ancient armored combat suits turn political rivalries into high-speed aerial duels across a world rebuilding from the ashes of a revolution. This clash of clashing egos and mechanical warfare finds its footing when a disgraced prince accidentally insults a fiery princess.

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