在镰仓街道的一角，静静地坐落着一间默默经营旧书买卖的旧书店。 　　这家店的主人是一位与旧书店完全不搭调的年轻貌美女子。只不过遗憾的是，女店主相当怯生，甚至让人为从事待客服务行业的她感到担心。 　　然而，与待人冷淡的态度相反，她对书籍持有超乎一般人的异常热情，并拥有非比寻常的旧书知识。不论是什么样的谜团、秘密，只要是与旧书有关的事，她都能解开。 　　这便是一本讲述“旧书与秘密”的故事Kamakura south of Tokyo has a special book store, which is operated by Shioriko. She loves her books, her store and stocks rarities and specialties. Daisuke also works there. A stranger targets the store and seems to be after something specific. The two set out to find out what the figure is after and how they should protect themselves.