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