At birth, Lys's heart did not beat. To save her, her mother struck a deal with a devil: Lys may borrow his heart until her 16th birthday, after which he will consume her body. Accompanied by Siva, a companion she met by chance in the desert at night, she travels as a dancer to find the devil who sealed her fate. During their journey, they unexpectedly encounter an egoistic prince and a ring spirit... A romance set in the world of A Thousand and One Nights, featuring the devil and the young girl.