The God of Light and the Goddess of Darkness have waged a ruthless war across the land of Toyoashihara for generations. But for fifteen-year-old Saya, the war is far away—until the day she discovers that she is the reincarnation of the Water Maiden and a princess of the Children of the Dark. Raised to love the Light and detest the Dark, Saya must come to terms with her heritage even as the Light and Dark both seek to claim her, for she is the only mortal who an awaken the legendary Dragon Sword, the weapon destined to bring an end to he war. Can Saya make the choice between the Light and Dark, or is she doomed—like all the Water Maidens who came before her...? (Source: Haikasoru)

When the heir to the empire comes to Mino, the lives of young Oguna and Toko change forever. Oguna is drafted to become a shadow prince, a double trained to take the place of the hunted royal. But soon Oguna is given the Mirror Sword, and his power to wield it threatens the entire nation. Only Toko can stop him, but to do so she needs to gather four magatama, beads with magical powers that can be strung together to form the Misumaru of Death. Toko’s journey is one of both adventure and self-discovery, and also brings her face to face with the tragic truth behind Oguna’s transformation. (Source: Haikasoru) *Note: It was released as two volumes in Japan.*

From Scholastic: Balsa was a wanderer and warrior for hire. Then she rescued a boy flung into a raging river - and at that moment, her destiny changed. Now Balsa must protect the boy - the Prince Chagum - on his quest to deliver the great egg of the water spirit to its source in the sea. As they travel across the land of Yogo and discover the truth about the spirit, they find themselves hunted by two deadly enemies: the egg-eating monster Rarunga and the prince's own father. A 10-book series with multiple side stories and a cookbook.