Husband of the Koto sound, Takashi are taking up a job leaving his family behind. Elderly Sister of Takashi divorced in such an occasion, Natsumi become a dependent on the parents' house where the Koto sound married couple lives in temporarily. Because the parents had already died, living together life of a Koto sound and the Natsumi of just two began. At a certain night, the Natsumi learns Koufun to hear a gasp voice to leak from the room of the Koto sound. Eyes of the Natsumi to see next day, a Koto sound turn gradually mysterious, and be smart….
