There is an antique shop in Kyoto's Teramachi Sanjou shopping district. High school girl Mashiro Aoi unexpectedly runs into Yagashira Kiyotaka, the son of the shop's owner, and ends up working part-time at the shop. Kiyotaka is called the "Holmes at Teramachi Sanjou," and he and Aoi solve odd cases brought to them by various clients.
In Kyoto's Teramachi Sanjo area, Mashiro Aoi attempts to sell her grandfather's hanging scrolls in the antique shop Kura. There she meets Yagashira Kiyotaka, a man with penetrating observation skills known as the Holmes of Kyoto.
Miyashita Saori, who is to serve in the starring role at the Aoi Festival, receives two threatening letters. She, her mother, and her little sister Kaori come to Kura to see if Kiyotaka can find out who sent them. But Kiyotaka's investigation leads to a surprising culprit.
Kiyotaka's father asks him and Aoi to visit the mountain villa of the Kajiwara family. The family patriarch left three hanging scrolls to his three sons when he died, but they have now all been mysteriously burned. What secrets did those hanging scrolls hide?
Kiyotaka's ex-girlfriend shows up at Kura, asking him to appraise a tea bowl she made. Meanwhile, Aoi's friends from Saitama are coming to Kyoto for the Gion Festival... and bringing her own ex along!
Kiyotaka is called to the Nanzenji Temple to solve a mystery. He goes there, accompanied by Akihito. While investigating the case of a missing dragon, the master appraiser crosses paths with a master counterfeiter...
Kiyotaka and Aoi attend the birthday party of a famous appraiser. As part of the entertainment, their host asks Kiyotaka to identify a painting. But the "game" comes with a secret message...
Aoi gets dressed up and attends Yagashira Seiji's sumptuous, star-studded 77th birthday party. But when the family's precious Celadon vase is targeted, it turns out there's more than money on the line.