Kindaichi and Miyuki are on a family trip to Hakuja Village. There, they run into Inspector Kenmochi, who is on the tail of a murderer. At the lodging, Kindaichi learns from the inn master, Kyoka, that the village has a tradition of worshipping white snakes as messengers of the gods. The three spot a suspicious-looking masked man entering the adjacent brewery. It is the White Snake Brewery, which has been run by the Shiragami family for generations, and which Otomatsu is currently presiding over as president. The suspicious man turns out to be Rengetsu, the Shiragamis' second son who had been missing for five years after a fire. His face and voice have changed following the fire, but a DNA test proves his lineage. Kindaichi and the others back down once the man's identity is known. The three are then given a tour around the brewery by the apprentice head brewer, Washimori, and they observe the craftsmen make sake.
