Nestlé has released a sake-flavored Kit Kat bar that is available only in Japan. The new variety is described as a mix of "chocolate with the mellow body and smooth aftertaste of sake," according to NarNari, a Japanese site.

Kit Kat sake contains 0.8 percent alcohol and comes in white chocolate. It's also packaged in an Isshobin, a traditional sake packaging.

"Children and lightweight drinkers are kindly requested for refraining from consuming this product," said Nestlé executive Takuya Hiramatsu, according to Confectionery News. "We expect Sake Kit Kat accelerates our inbound business growth."

Kit Kat is Japan's best-selling chocolate bar and where one can find different flavors of the snack that are not sold elsewhere, such as purple sweet potato, bean cake, edamame and sakura, according to CNBC.

Japan also has the only Kit Kat boutique, Seibu Ikebukurohonten, which opened in 2014. The store sold out 500 Kit Kat bars in under two hours its opening day, according to Time Out Tokyo.

Kit Kat brand manager Stewart Dryburgh said the candy might be popular in Japan because its name sounds similar to "kitto katsu," which means, "you will surely win." Hence, the Japanese think Kit Kats are lucky charms. More often, these uniquely flavored Kit Kats are given as gifts to business partners and foreign guests as a gesture of goodwill.

It's not likely these Kit Kats will make its way to the U.S. market as the chocolate's trademark is owned by Hershey. The company carries a different approach to marketing the product for American consumers, Confectionery News reported further.