A beautiful discovery outside the window of her underwater home prompts the reclusive E. to begin a correspondence with renowned scholar Henerey Clel. The letters they share are filled with passion, at first for their mutual interests, and then, inevitably, for each other. Together, they uncover a mystery from the unknown depths, destined to transform the underwater world they both equally fear and love. But by no mere coincidence, a seaquake destroys E.'s home, and she and Henerey vanish.

A Great Winged One will soon arise and cast his fearsome shadow upon the land. And just as Night slays Day, and Day slays Night, so also shall another Black Witch rise to meet him, her powers vast beyond imagining. So foretells the greatest prophecy of the Gardnerian mages. Carnissa Gardner, the last prophesied Black Witch, drove back the enemy forces and saved her people during the Realm War. Now a new evil is on the horizon, and her granddaughter, Elloren, is believed to be Carnissa's heir—but utterly devoid of power in a society that prizes magical ability above nearly all else.

Deadly storms have ravaged Mina’s homeland for generations. Floods sweep away entire villages, while bloody wars are waged over the few remaining resources. Her people believe the Sea God, once their protector, now curses them with death and despair. In an attempt to appease him, each year a beautiful maiden is thrown into the sea to serve as the Sea God’s bride, in the hopes that one day the “true bride” will be chosen and end the suffering.

Brie hates the Fae and refuses to have anything to do with them, even if that means starving on the street. But when her sister is sold to the sadistic king of the Unseelie court to pay a debt, she'll do whatever it takes to get her back—including making a deal with the king himself to steal three magical relics from the Seelie court.

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.