A boy discovers he can handle magical relics and immediately gets saddled with protecting a dragon girl from people who want to weaponize her. The show treats this premise with genuine stakes instead of winking at the camera about how absurd it is. Ryuji's commitment to Rose isn't romantic posturing, it's the core of why anything in this story matters. The action moves fast enough that you don't have time to overthink the setup. By the finale, you realize the show was never about winning fights; it was about whether Ryuji could actually save someone, or if he'd just become another relic in someone else's collection.

Kisaragi Ryuji is an ordinary high school student whose peaceful routine ends when his second cousin Eriko suddenly comes back from overseas. She brings him into her organization, the Seven Tails, to help track down artifacts known as Lost Precious. Together they take a relic box from a black broker called Fang, and inside they find a girl. Ryuji names her Rose after the rose-like mark on her left hand. When Rose turns out to be a Red Dragon, Ryuji resolves to shield her from the black organization, fighting with his powers as a level 10 Breaker. Adapted from a light novel series, the show blends action, romance and the supernatural.