The Black Tortoise Realm

Above Blue Star, streaks of red and blue descend. Spiritual qi revives across Blue Star, and blood beasts suddenly emerge. To resist them, people build towering walls. In the slums outside the city, Xu Ying is swept into a maelstrom. The aunt who raised him for eight years is dead, his younger sister has been taken, and his memories are incomplete. What should Xu Ying do?