"Hortensia Saga" is set in the kingdom of Hortensia, a land plunged into turmoil following a coup d'état orchestrated by the traitorous Duke Alfred Ober. The story begins with the assassination of King Ferdinand, which destabilizes the kingdom and allows Alfred to seize power. The royal family is scattered, and the kingdom falls into chaos. Amid this upheaval, a group of loyal knights and rebels emerges to resist Alfred's tyranny and restore order.

The protagonist, Marius, is a young knight who survives the initial attack on the royal family. He is joined by his childhood friend, Runa, a skilled archer, and other allies, including the noble knight Alfred (not to be confused with the traitorous Duke), and the mysterious mercenary, Nonn. Together, they form a resistance group dedicated to overthrowing Duke Alfred and uncovering the truth behind the coup. Their journey is marked by battles, political intrigue, and personal struggles as they rally support from across the kingdom.

Central to the narrative is the relationship between Marius and Runa, whose bond is tested by the challenges they face. Runa, who harbors feelings for Marius, must navigate her role as both a warrior and a confidante. Meanwhile, Marius grapples with his duty to the kingdom and his desire to protect those he cares about. The group also encounters other key figures, such as the exiled princess Aurelia, who becomes a symbol of hope for the resistance, and the enigmatic scholar, Robert, who provides crucial knowledge about the kingdom's history and the true motives behind the coup.

The plot unfolds through a series of battles and strategic maneuvers as the resistance grows in strength. The story explores themes of loyalty, sacrifice, and the cost of war, with characters often forced to make difficult choices. The traitorous Duke Alfred is revealed to have deeper motivations tied to the kingdom's past, including a connection to a long-forgotten conflict involving a powerful artifact known as the "Hortensia." This artifact becomes a focal point in the latter half of the series, as both sides seek to control its immense power.

As the resistance gains momentum, alliances are forged and broken, and the true extent of Duke Alfred's plans is unveiled. The climax centers on a final confrontation between the resistance and Alfred's forces, with the fate of the kingdom hanging in the balance. The resolution ties together the personal arcs of the main characters while addressing the broader political and historical conflicts that shaped the story. The series concludes with a focus on the resilience of the human spirit and the enduring hope for a brighter future.