Twin sisters Mio and Mayu, while visiting a vacation spot from their childhood, become lost in a dark forest. The path disappears behind them as they enter the Lost Village, a place that vanished from the living world years ago. Ghosts of the townspeople walk the streets and search for the twins, intent on completing a dark ritual long left unfinished. Mayu begins to grow distant from Mio as well, and she begins to speak as if she were another person entirely. By chance Mio finds the Camera Obscura, and with its powers she searches for a way out get her sister and herself out of the village.