ドラゴンクライシス!

High schooler Ryuuji Kisaragi's ordinary life ends when his cousin Eriko drags him into seizing a sealed relic box from a black-market broker, and the box turns out to hold a girl who can become a dragon. Ryuuji names her Rose for the rose-shaped mark on her left hand, and as a Breaker, one of the hunters who handle magical relics, he takes it on himself to keep her safe from the criminal organization that wants her back. The light novel follows the pair as Ryuuji is pulled into a world of relics and the people who fight over them.