Aoi Mashiro, a high school girl who recently moved to Kyoto, takes her grandfather's ancient scrolls to Kura, an antique shop in the city's bustling Teramachi-Sanjo shopping area, for evaluation. Unexpectedly, she ends up working part-time at the store. The manager's son, Kiyotaka Yagashira, known as the 'Holmes of Kyoto' for his remarkable deduction skills, teams up with Aoi to unravel peculiar mysteries tied to the antiques presented by their customers.