Aya, a girl who has lost all her memories, was accidentally adopted by the king of Gladier City when she was young and raised. One is a high-ranking king, and the other is a close sister. Although the relationship seems to be brother and sister, ambiguity gradually develops, and then the mystery of her life experience gradually emerges. With innate power and the loyalty of the four spiritual beasts, disasters that no one could have predicted followed. Relatives, friends, lovers, love and hate, under the turning of the gears of fate, Ling is looking for the answer she has wanted throughout her life.