Back in February, I told you about the dark chocolate diet fad that was sweeping Japan, a genius eating plan that involves consuming 50 grams of dark chocolate every day as a way to lose weight. Since then, dark (or bitaa, bitter) chocolate has spread like a shadowy plague over the candy aisle. I mean this literally, as the packaging for all this dark chocolate is invariably black or brown, making for very monochromatic supermarket shelves.

But this isn't one of those disastrous shadowy plagues. Nothing leading to the mass-marketing of KitKat Bitter could be considered a disaster -- unless you happen to be on a non-dark chocolate diet. Then it would be very bad indeed.

Because this candy is GOOD. I-could-eat-this-every-day-and-maybe-twice-on-Sunday good. Here are my feelings on limited edition KitKats, since I'm sure you're dying to know: they're generally overrated. I've tasted KitKats flavored like sakura, uji-kintoki, fruit parfait, azuki and wine. In my opinion, none tasted better than KitKat the Original, a very good candy indeed. Basically, I'm not a fan of fake-chocolate coating, no matter how exotically flavored.

But sometimes the milk-chocolatiness of plain KitKats can be a bit cloying. This is where KitKat Bitter glides in, sleek in its deep brown box and sporting "high grade cacaomass," not to mention 139mg of polyphenols. You won't contemplate buying a whole store-display's-worth of these for health reasons, though, believe me. The perfect balance of bitter and sweet, this is a KitKat worthy of all the KitKat hype.

And the best news? This isn't a limited edition candy, at least not in bitter-chocolate-obsessed Japan.