Undefeated Bahamut Chronicle (最弱無敗の神装機竜バハムート, Saijaku Muhai no Bahamūto, lit. “Undefeated Weakest Bahamut”) is a Japanese light novel series, written by Senri Akatsuki and illustrated by Ayumu Kasuga and Yuichi Murakami. A manga adaptation written by Itsuki Watanabe, with art by Fumi Tadauri, was serialized by Square Enix and GA Bunko’s online magazine Gangan GA. Five years ago, a revolt has overthrown the Arcadia empire. The empire’s former prince, Lux Arcadia, accidentally trespasses in a female-only bathing area, and witnesses the new kingdom’s princess Lisesharte Atismata naked. After a duel with Lisesharte, Lux attends the female-only academy where they train students to become royal Drag-Knights.