A boy, alone in a black world, feels emptiness and makes a window with a white paper. A light comes into his black world, and he sees another black world through the window. The boy flies all his papers into the air to make windows in the world as many as he can. People enjoy the light by the windows. One day, the boy sees a man curled up in his world. The boy makes a paper airplane with his paper and sends it to the man.