The little sparrow murders

An old friend of Kosuke Kindaichi's invites the scruffy detective to visit the remote mountain village of Onikobe in order to look into a twenty-year-old murder case. But no sooner has Kindaichi arrived than a new series of murders strikes the village - several bodies are discovered staged in bizarre poses, and it soon becomes clear that the victims are being killed using methods that match the lyrics of an old local children's song.