Naoya Fukamachi is always alone. Ever since he saw his deceased grandfather at the Blue Lantern Festival eight years ago, Naoya has developed the ability to tell lies. If the other person is lying, his voice will turn into an incredibly harsh and strange sound. His parents, who noticed his ability, became estranged out of fear, and he has embraced loneliness alone ever since. When he entered college, he took the "Folklore II" elective, and the associate professor in charge of this course, Akiyoshi Takatsuki, caught Naoya's attention. There are no lies in what Professor Takatsuki says, and his voice sounds very comfortable. And this Professor Takatsuki has the ability of instant memory, and is only interested in strange phenomena in the world... Associate Professor Takatsuki, who has the ability of instant memory, and Naoya, a college student who can tell other people's lies, will work together to solve the mystery of these strange phenomena!