The film is adapted from the best-selling children's book of the same name, about the primary school boy Orion has a strong survival crisis and fear, afraid of a lot of things, especially the dark. But one day, "Black" became a living entity and appeared in front of him, and unexpectedly became close to him. In the end, Orion has to decide whether he can learn to accept the unknown, to get rid of the control of fear over his life, and to embrace the joy of life.