If you go to Nestle Japan's website, they will typically have 2-3 limited edition Kit-Kats out at any time. It's hard to find them in the stores sometimes! They are usually seasonal flavors!
First up - Lemon Vinegar Kit-Kats!
Sounds really weird, right?
Actually they taste like Key Lime Pie!
These have been discontinued for a while!
Secondly - Royal Milk Tea Kit-Kats!
I think these aren't going to be available much longer since they were on clearance at the supermarket!
Lastly, I found these really recently - Strawberry Kit-Kats!
They should really make these a permanent flavor!
These are going into some girl's love packs soon!!