Book of Embers: Chapter of Order

When I was seventeen years old, my sister and I received an unexpected gift. Like a signal bomb that suddenly rose into the sky, it not only lit up the unknown road ahead, but also attracted a mysterious messenger called the "Order Bureau". This organization that maintains the balance of the world has extended an olive branch to us and opened a door to the unknown for us. They tell us that the world operates on a fragile but sophisticated set of rules... My father always said that my mother just "left". But why is it that everything about her, including photos, traces, and evidence of her existence, seems to have been completely wiped out by some invisible force, leaving no trace behind? And whenever we asked, there was only an empty blankness in my father's eyes that could not read any emotion. In the Order and Organization Bureau, my mother's files were classified as top secret, and even those with the highest authority within the organization could not access them. But we were given a code name - "The Heirs of Cangming". The end of finding our mother seems to be the real starting point of our confusing destiny. That road leads beyond the rules and to the truth of our identity...