Will (Alexander Ludwig) moved from the United States to the United Kingdom with his parents. It is not easy for Will, who is naturally timid and shy, to adapt to the new environment, new school and new friends. In an accident, Maryman (Ian McShane) and Miss Gracethorne (Frances Conroy) appeared in front of Will. They told Will about the magical legend flowing in his blood. Once, the "hunter" representing light and the "knight" representing darkness have always been fighting against each other. However, with the passage of time, the lineage of the light chaser gradually fell, and Will turned out to be the last heir of this bloodline. In order to defeat the re-emerging dark knight, Will must travel through time and space to find six seals that imprison the power of light. Facing a powerful opponent, can the timid Will really complete the task smoothly?