KitKat globally is run by Nestle.
That's one reason why.
The second is that in Japan Kit Kat sounds like "good luck" which is why they became popular, and two, why we see such regional variation.
(I have 4 Japanese flavors in my NYC fridge right now -- Sweet Potato, Adult Sweetness, Wheat, and Caramel Pudding (which you bake!)
Another perk I've found about treats from overseas is they use actual sugar instead of high fructose corn syrup.
>"Ingredients: Chocolate (Sugar, Lactose, Vegetable Oil(palm)whole milk powder, cocoa butter), wheat flour, vegetable oil, lactose, sugar, caramel powder (skim milk, concentrated milk), yeast extract, cocoa powder, whole milk powder, cocoa mass, cocoa butter, emulsifier(lethal, sucrose fatty acid ester, glycerin fatty acid ester), sodium bicarbonate, flavor, yeast extract,(contains wheat, milk, soybeans)"
https://community.gaijin.net/issues/p/warthunder/i/WpsnCaNDw...
Kitto katsu! means "you will surely win" or "you will surely succeed".
So it is given as tokens for success in exams and the like.
Katsu for winning/succeeding also can be seen in Tonkatsu = pork cutlet (katsu is the Japanese "shortening" of cutlet), which is also offered as a success token.
I'm sorry, what?
Oh my god I have some of these I should have looked at the back of the package more closely!