Japan has been produced many kinds of flavoured KitKat, I've already introduced some of them as one of KitKat lovers.
This early Spring, Sake Flavoured KitKat is found in some convenient stores or somewhere. And actually this tastes better than I expected. You may know "Sake Kasu" that is produced during Sake brewing process, this KitKat contain Sake Kasu and Sake, it can't be wrong.
So...if you are a fan of Sake and KitKat... then grab it!