At Cafe Poirot, Azusa reveals that she must have a doppelganger because she wasn't at the concert hall,l. Everyone began to wonder who the doppelgänger was (refer to ep 866-867). Heiji receives a letter from Densuke Takekuma, the mayor of Yadori village, saying he got a hint about the Takugawa’s hidden treasure and is asking for help to unearth it.