"If there is a next life, I will save you." Aria is the last remaining siren, a monster who bewitches humans with song. Shackled, she is forced to sing to nobles until she coughs blood. By the time the demonized Grand Duke Lloyd Valentine frees her, it's too late. She has already breathed her last... or so she thinks. When she awakens in the past, Aria dedicates her life to protecting the duke, but she wonders if that's really all her life is worth. Will she ever be free? Or is this siren destined to sing the same song forever?