Su was born into a bleak future, where the military keeps tight control over the few children born with magical abilities -- known as "Clovers." The Clovers are forcibly tattooed with a symbol that indicates their potential power, and Su is the only four-leaf Clover in the world. Kept locked away in isolation her whole life, Su longs to find happiness in the outside world. An agent named Kazuhiko appears to help grant Su's wish, but he soon realizes that there is more to the mysterious girl than meets the eye...