It's the second round of Shizuku and Issei's battle. Yutaka invoked the image of the Mona Lisa when describing the Second Apostle in his will, and the two of them have three weeks to identify the wine and its vintage. In order to cultivate his internal “thirst” for wine, Issei decides to go on a backpacking trip across the deserts of China-while Shizuku is asked by mystery writer Maiko Natsuyagi to investigate a label-less bottle of wine, sent to her with a threatening letter.