Lys was born without a heartbeat. To save her life, her mother made a contract with a devil: Lys could borrow the devil's heart until her sixteenth birthday, but on that day the devil would come to claim her body in return. As a result of the pact, a splendid flower-shaped mark blooms on Lys's chest, marking her as a "flower bearer" and causing many people to shun her out of fear.

Now a young woman, Lys travels through desert towns as a dancer, searching for the devil who holds her fate. At her side is Siva, a companion she met by chance in the desert one night. Siva is both her protector and her closest friend, always watching over her as she performs to earn their way. Along their journey, they encounter an egotistical prince and a mysterious ring spirit, encounters that add new complications and allies to their quest.

The story unfolds against a richly drawn desert setting inspired by Arabian Nights aesthetics, blending fantasy, romance, and supernatural elements. As the deadline of Lys's sixteenth birthday approaches, the search for the devil grows more urgent. Siva's own nature and his bond with Lys become central to the unfolding drama, and the line between rescuer and capturer grows thin. The narrative traces Lys's struggle to reclaim her own fate, the deepening connection between her and Siva, and the question of whether a contract sealed in desperation can ever be undone.