These are just a few of the Kit Kat flavors of Japan, a country where the love of this crispy chocolate wafer runs deep.

And one man continues to push the flavor frontier further and further.

But before we get to him, here's a little background info.

(Yuji speaking in foreign language) Kit Kat first came to Japn in 1973. It's a very popular chocolate. In fact, it's the number one product in the Japanese chocolate market.

And there are a lot of flavors to choose from.

(Yuji speaking in foreign language) Until now, there have been over 400 types of Kit Kats sold in Japan.

And those flavors can change based on where you are in the country.

(Yuji speaking in foreign language) From Hokkaido to Okinawa, there are special flavored Kit Kats for each region.

For example, Hokkaido has melon, Kyushu has purple sweet potato.

And the genius behind many of these flavors is a classically trained pastry chef.

(Yasumasa speaking in foreign language) My name is Yasumasa Takagi, and I'm a pastry chef.

In my time, Kit Kat had only the milk chocolaye base.

Since I became involved, it's no longer the case.

The first flavor was passion fruit-passionate passion fruit.

I've made over 50 different flavors, but I've made many many more prototyoes.

We have products that [make people] go, "worw" or"hmm."

I start in my own kitchen of my store and make the prototype.

First, we prepare the chocolate. Then, we cut and prepare the wafer.

We pour the chocolate into the mold. Then, we put the cut wafers in and pour chocolate on top.

(Yuji speaking in foreign language)

And for good reason.

In Japan, Kit Kats have evolved into more than just a sweet treat.

(Yuji speaking in foreign language)

And for those of you who think it's all business for Chef Takagi, gimme a break.

(Yasumasa speaking in foreign language)