Half of the time I don't have a clue of what they are talking about. I am such an ignorant in everything related to wine (but now I can say I gained some tiny knowledge). As Shizuku says, "You cannot really know a wine until you drink it".
Most the volume is about Shizuku and Miyabi helping the owner of a restaurant to select the perfect wine for each menu. Also, there are a lot of tips and explanations to find good, cheap wines