Hanatsukihime

花月姫

Lys was born without a beating heart. To keep her alive, her mother struck a contract with a devil: Lys borrows his heart until she turns sixteen, after which he claims her body. Traveling as a dancer with Siva, a companion she met by chance one night in the desert, she searches for the devil who sealed her fate. Their road soon crosses a self-centered prince and a spirit bound to a ring.