On a mountainside at the edge of the Kaigenese Empire live the most powerful warriors in the world, superhumans capable of raising the sea and wielding blades of ice. For hundreds of years, the fighters of the Kusanagi Peninsula have held the Empire's enemies at bay, earning their frozen spit of land the name "The Sword of Kaigen". Born into Kusanagi's legendary Matsuda family, f14-year-old Mamoru has always known his purpose: To master his family's fighting techniques and defend his homeland.

Ester’s family was torn apart when a manticore killed her mother and baby brother, leaving her with nothing but her father’s painful silence and a single overwhelming need to kill the monsters that took her family. Ester’s path leads her to the king’s Royal Mews, where the giant rocs of legend are flown to hunt manticores by their brave and dedicated ruhkers. Paired with a fledgling roc named Zahra, Ester finds purpose and acclaim by devoting herself to a calling that demands absolute sacrifice and a creature that will never return her love.

The Catenan Republic—the Hierarchy—may rule the world now, but they do not know everything. I tell them my name is Vis Telimus. I tell them I was orphaned after a tragic accident three years ago, and that good fortune alone has led to my acceptance into their most prestigious school. I tell them that once I graduate, I will gladly join the rest of civilized society in allowing my strength, my drive, and my focus—what they call Will—to be leeched away and added to the power of those above me, as millions already do. As all must eventually do.

Darrow is a Red, a member of the lowest caste in the color-coded society of the future. Like his fellow Reds, he works all day, believing that he and his people are making the surface of Mars livable for future generations. Yet he toils willingly, trusting that his blood and sweat will one day result in a better world for his children. But Darrow and his kind have been betrayed. Soon he discovers that humanity reached the surface generations ago. Vast cities and lush wilds spread across the planet. Darrow—and Reds like him—are nothing more than slaves to a decadent ruling class.

Twelve-year-old Montego al'Bou is an orphan, a provincial peasant boy left alone by the recent death of his grandmother. Possessing nothing more than his grandmother's cudgel, he strikes out to the capital where the influential Grappo have offered to bring him up in the luxury of an Ossan guild-family. He finds his welcome frosty, his new home full of confusing responsibilities.