"Dragon Century" is a fantasy anime series set in a world where dragons and humans coexist, often in conflict. The narrative centers on a young dragon rider named Kael, who discovers he is the last descendant of an ancient lineage with the unique ability to communicate with dragons. This ability, known as the "Dragon Whisper," becomes pivotal as the story unfolds. Kael's journey begins when his village is destroyed by a rogue dragon, forcing him to seek answers about his heritage and the mysterious power he possesses.

The plot expands as Kael joins forces with a diverse group of allies, including Lyra, a skilled warrior with a tragic past tied to dragon slayers, and Ryn, a rogue dragon who defies the violent tendencies of his kind. Together, they uncover a conspiracy orchestrated by the Shadow Council, a secretive organization seeking to exploit dragon power to dominate the world. The Council's experiments have led to the creation of corrupted dragons, which threaten both human and dragon societies.

As Kael and his companions travel across the continent, they encounter various factions, including the Dragon Knights, an elite order dedicated to maintaining peace between humans and dragons, and the Crimson Flame, a radical group of humans determined to eradicate dragons entirely. The series explores themes of coexistence, prejudice, and the consequences of unchecked ambition. Kael's growth as a leader and his struggle to reconcile his human and dragon identities form the emotional core of the story.

The narrative builds toward a climactic confrontation with the Shadow Council, where Kael must confront the truth about his lineage and the origins of the Dragon Whisper. The resolution hinges on his ability to unite humans and dragons against a common enemy, challenging the deeply ingrained animosities between the two species. The series concludes with an open-ended finale, hinting at future conflicts and the ongoing struggle for harmony in a divided world.