ZONe ENERGY [Kai]

Posted on January 12, 2026 | Last updated January 13, 2026

Released on January 13, 2025, this is a review of "ZONe ENERGY [Kai]", the latest new release in ZONe ENERGY’s annual New Year lineup.

This limited-edition product is designed for the exam season and features a cool visual filled with scattered mathematical formulas. From this design and this color scheme, what kind of flavor comes to mind? With that in mind, I will dive into the review.

ZONe ENERGY [Kai]

Manufacturer	SUNTORY FOODS
Country of Origin	Japan
Price	223 JPY
Flavor	Muscat
Total rating	★★★★☆

Author information Author: Energy Drink-kun

In 2001, while living in the United States, I encountered energy drinks through the dance scene and was deeply impressed. After returning to Japan, I found that energy drinks were considered novelty beverages, so I established a comprehensive website in 2013 to share the true appeal of energy drinks. As an energy drink enthusiast, I began drinking them seriously again, collecting over 8,000 varieties of energy drinks from various countries. I am also active as a critic and expert, receiving media interviews.

Flavor of ZONe ENERGY [Kai]

When I open the can, a sweet and refreshing muscat aroma bursts out. This scent is outstanding, and I feel the recreation of juicy muscat flesh is extremely accurate. Now, let’s take a sip.
Flavor of ZONe ENERGY [Kai]
As soon as it hits the palate, a sweet-and-tart, refreshing muscat flavor spreads with a smooth, crisp mouthfeel.

Along with its highly polished, real-fruit-like aroma, the mellow sweetness of sugar delivers a fresh, juicy taste reminiscent of actual muscat flesh.

The aftertaste is refreshing and never lingers too long, with the aroma naturally fading away, creating a well-balanced drinking experience. Because of this, the muscat flavor remains consistently enjoyable with the second and third sips, filling the mouth with each taste before I realize I have finished the entire can.

Of course, there is no unnecessary chemical note or artificial taste, and it truly delivers the deliciousness of real fruit.

Energy Ingredients of ZONe ENERGY [Kai]

Energy Ingredients of ZONe ENERGY [Kai]
Contains 75 mg of caffeine and 400 mg of arginine.

Even among the ZONe series, which is known for its high sugar content, ZONe ENERGY [Kai] contains a relatively high amount at 52.4 g. I want to be careful not to drink too much.
⇒ Energy Drinks Ranked by How Bad They Are for Your Health

Design of ZONe ENERGY [Kai]

A beautiful, captivating design featuring a glossy, transparent clear blue base covered with countless mathematical formulas.
Design of ZONe ENERGY [Kai]
However, it is a bit disappointing that the large “[Kai]” used in the product name feels oversized, and its combination with the alphanumeric characters covering the entire can creates a sense of mismatch that seems to disrupt the overall atmosphere.

Design of ZONe ENERGY [Kai]
The “e = 2.7182....” swirling around the ZONe logo represents Napier’s constant.

Many other formulas are also scattered across the design, appearing and disappearing as if floating.
Design of ZONe ENERGY [Kai]
These were supervised by the YouTuber Yobinori Takumi. It is a design that conveys both a beauty that makes me feel my mind would sharpen after drinking it and a clear concept befitting a limited-edition product for the exam season.