"Magi: Adventure of Sinbad" is a prequel to the main "Magi" series, chronicling the early life and rise of Sinbad, a legendary figure destined to become one of the most influential kings in the world. The story begins in the war-torn country of Parthevia, where a young Sinbad lives with his mother, Esra. After his father, Badr, is killed in battle, Sinbad vows to end the cycle of war and suffering plaguing his homeland. His journey begins when he encounters a mysterious dungeon, a towering structure filled with trials and treasures, guarded by a powerful Djinn. By conquering the dungeon, Sinbad gains the allegiance of the Djinn Baal, marking the start of his transformation into a charismatic leader.

As Sinbad grows, he gathers a loyal group of companions, each with their own unique skills and backgrounds. Among them are Drakon, a warrior from the Kou Empire; Hinahoho, a giant from the Tison Tribe; and Ja’far, a former assassin who becomes one of Sinbad’s closest allies. Together, they travel across the world, encountering various nations, cultures, and political intrigues. Sinbad’s charisma and strategic mind allow him to forge alliances, resolve conflicts, and establish the foundation for his future kingdom, Sindria. His ultimate goal is to create a world where people can live in peace, free from the oppression of tyrants and the devastation of war.

Throughout the series, Sinbad faces numerous challenges, both external and internal. He must navigate the complexities of leadership, balancing his ideals with the harsh realities of power. His journey is marked by moments of triumph and loss, as he learns to harness his abilities and inspire others to follow his vision. The narrative also explores the origins of key elements from the main "Magi" series, such as the concept of Dungeon Capturers, the role of Djinn, and the geopolitical landscape that shapes the world.

The series delves into themes of ambition, friendship, and the moral dilemmas of leadership. Sinbad’s character is portrayed as both heroic and flawed, showcasing his determination to achieve greatness while grappling with the consequences of his actions. The supporting cast adds depth to the story, with their personal struggles and growth reflecting the broader challenges of building a better world. "Magi: Adventure of Sinbad" serves as a compelling origin story, providing context for Sinbad’s legacy and his impact on the events of the main series.