"Genghis Khan: To the Ends of the Earth and Sea" is a historical manga that chronicles the life and conquests of Temüjin, who later becomes known as Genghis Khan, the founder of the Mongol Empire. The narrative begins with Temüjin's early life, marked by hardship and struggle, as he grows up in the harsh steppes of Mongolia. Born into the Borjigin clan, Temüjin faces betrayal, loss, and exile after his father, Yesügei, is poisoned by rival Tatars. These formative experiences shape his resolve and leadership qualities.

The story delves into Temüjin's rise to power, highlighting key events such as his alliance with Jamukha, a childhood friend turned rival, and his marriage to Börte, who becomes a pivotal figure in his life. The manga portrays Temüjin's strategic acumen and ability to unite the disparate Mongol tribes under his leadership, culminating in his proclamation as Genghis Khan, the "Universal Ruler." His vision extends beyond mere conquest; he seeks to create a unified empire that transcends tribal divisions.

Central to the narrative are the military campaigns that define Genghis Khan's legacy. The manga meticulously details his campaigns against the Jin Dynasty, the Khwarezmian Empire, and other adversaries, showcasing his innovative tactics, such as psychological warfare and the use of mobility in battle. The story also explores the complexities of his rule, including the establishment of the Yassa, a legal code that governed the Mongol Empire, and his efforts to promote trade and communication across vast territories.

The characters are portrayed with depth, reflecting their historical significance. Genghis Khan is depicted as a multifaceted leader, driven by ambition yet deeply connected to his people and family. Börte, his wife, is portrayed as a strong and supportive figure, while Jamukha serves as a foil, embodying the tensions of loyalty and rivalry. Secondary characters, such as Genghis Khan's sons and generals, contribute to the narrative's richness, illustrating the dynamics of leadership and succession within the empire.

The manga balances historical accuracy with dramatic storytelling, offering a comprehensive portrayal of Genghis Khan's life and the forces that shaped his empire. It captures the scale of his achievements while humanizing the man behind the legend, presenting a nuanced exploration of power, ambition, and legacy.