"The Princess of Blue Roses" is a fantasy romance manga set in a world where the existence of blue roses is tied to a powerful curse. The story centers on Princess Liliana, the sole heir to the throne of a kingdom plagued by a centuries-old curse that causes blue roses to bloom only when tragedy strikes. These roses are both a symbol of the kingdom's suffering and a source of its magical power. Liliana, burdened by her role as the "Princess of Blue Roses," is destined to bear the weight of this curse, which has claimed the lives of her ancestors.

The narrative begins with Liliana preparing for her coronation, an event that traditionally triggers the curse's activation. However, her life takes an unexpected turn when she encounters a mysterious knight named Cedric, who claims to have been sent to protect her. Cedric harbors secrets of his own, including a connection to the curse and a past shrouded in betrayal and loss. As Liliana and Cedric grow closer, they uncover hidden truths about the curse, the kingdom's history, and the true nature of the blue roses.

The plot unfolds through a series of political intrigues, magical confrontations, and emotional revelations. Liliana struggles to reconcile her duty to her people with her desire to break free from the curse's cycle. Cedric, torn between his loyalty to Liliana and his own haunted past, becomes a key figure in her quest to unravel the curse's origins. Along the way, they encounter allies and adversaries, including a rogue mage who seeks to exploit the curse for personal gain and a rival kingdom with its own agenda.

Themes of sacrifice, love, and the struggle against fate are woven throughout the story. Liliana's journey is marked by her determination to forge a new path for her kingdom, even as the curse threatens to consume her. The relationship between Liliana and Cedric evolves from one of mutual distrust to a deep bond, with their shared mission to break the curse serving as the emotional core of the narrative.

The manga balances moments of intense drama with quieter, introspective scenes, creating a layered exploration of its characters and their motivations. The world-building is rich, with detailed lore surrounding the curse, the blue roses, and the political landscape of the kingdom. The story builds toward a climactic confrontation that tests the limits of Liliana's resolve and the strength of her bond with Cedric, ultimately leading to a resolution that redefines the fate of the kingdom and its people.