Mio and Mayu Amakura, two twin sisters, visit a place they loved in their childhood. Mayu walks weakly and accidentally encounters a mysterious butterfly. She follows the butterfly until she reaches a forest. Concerned for her twin, Mio follows her all the way. The two sisters eventually arrive at a village hidden in the fog, which seems to be abandoned. The twins quickly understand the suffering of spirits who are forced to wander in the world of the dead, and they enter the village. The Amakura sisters try to uncover the truth and discover a mysterious camera.