The narrative takes place in an old Western-style hospital where Takumi is confined. Following an accident, Takumi has acquired certain strange abilities. He is able to perceive the "deep voices" of past events bound to various locations within the hospital, and occasionally enters other people's consciousness while asleep. Alongside Amano Aki, he attempts to investigate the hospital's mysterious past. Simultaneously, a doctor named Yanagi Hiroko seeks to study Takumi's unusual ability.