Under the seemingly ordinary modern city, there is a parallel space called the "Shadow World" hidden. Here live the "light eaters" that are caused by human negative emotions. They feed on the light in human souls. Those who are devoured will gradually lose their emotions and memories and become walking zombies. Fighting against them are the "Light Breakers" who have been passed down from generation to generation. They have special blood and can fight the light eaters through ancient magic weapons and purify the contaminated light of souls. However, with the development of science and technology, the light-eaters gradually mastered new ways of parasitism, and the living space of the light-breakers was also threatened by the mysterious organization "Dark Pupil".
