A 200-Year-Old Grilled Chicken Restaurant Loses Its Secret Sauce That Had Been Continuously Maintained Since the Edo Period

"Hikawa did it! Hikawa caused trouble!" "Hikawa? But that guy just started operating!" A yakitori restaurant facing business difficulties introduced Hikawa EX, a humanoid automatic cooking robot that resembles a popular singer, as a "customer-drawing Hikawa" to generate buzz and attract customers. Although the unveiling event was a success, the next day the yakitori shop discovers that their secret sauce—carefully preserved and passed down since the restaurant's founding—has disappeared.