The gourmet bars are available only for the winter season in the country, and use cacao nibs shipped over from Islay — home to a number of ancient distilleries.
The company says the new bar is “a bitter chocolate for adults that lets consumers enjoy a hint of refined whisky aroma and taste.”
The Scottish island of Islay is home to several ancient distilleries.
“During the 180-day period, whisky barrels are manually rotated at a pace of once a week and this puts all of the cacao nibs in the barrel into contact with the whisky barrel’s interior,” the company said.
The bars are only available online in whisky-loving Japan and from KitKat’s speciality Chocolatory shops, located in a handful of Japanese cities, at a price of 300 yen ($2.90).
In 2019, the country exported 1.3 billion bottles to 175 markets around the world, bringing in £4.9 billion ($6.5 billion) to its economy.
Ardbeg, Lagavulin and Laphroaig are all produced on Islay, with production of each whisky lined up on a narrow two-mile stretch of coastal road on Islay’s southern shore.
But the entire island was sealed off during the British lockdown earlier this year; the only ferries that arrived were delivering supplies, and the only people allowed off-island were those with medical emergencies.
CNN’s Adrian Mourby contributed reporting.