On December 16, 2025, a uniquely innovative gummy will appear on the shelves of FamilyMart stores in Japan. Its name is “RIRONE PERFECT GUMMY.” This product is a new style of assorted gummy developed with the concept of supporting you during times of focused thought, such as studying or working.
The reason this gummy is gathering so much attention is that it was supervised by Gento Kono, known in the Japanese media as the “Divine Brain of the University of Tokyo’s Faculty of Medicine.” His background is astonishing: not only did he pass the entrance exam for the University of Tokyo’s Faculty of Medicine, Japan’s most difficult, straight out of high school, but he also passed the bar exam (the exam to become a lawyer), the national medical licensing exam, and the certified public accountant exam while still a student. He is truly a professional of learning.
Now, a new product has been born from his brand “RIRONE,” which is developed around the theme of “what I truly wanted for myself.”
Supporting Your Thoughts with Three Flavors and Textures
The most significant feature of “RIRONE PERFECT GUMMY” is that one bag contains three types of gummies, each with a different flavor and texture. Each has different ingredients, offering the enjoyment of choosing one according to your mood.
Ramune Flavor (with Glucose) — A Firm, Crunchy Texture
This is a Ramune-flavored gummy formulated with glucose, which is great for when you want to concentrate. Ramune is a carbonated soft drink famous in Japan for its glass bottles sealed with a marble, a staple at Japanese summer festivals. Its refreshing flavor and the satisfyingly firm, crunchy texture might just be the trigger to switch on your thinking mode.
Lemon Flavor (with Citric Acid) — A Melty, Oozing Texture
A lemon-flavored gummy with citric acid, perfect for when you want to refresh. In contrast, this one features a texture where a sauce melts and oozes from the center. Its refreshing tartness and soft mouthfeel will help you change your mood.
Yogurt Flavor (with GABA) — A Chewy Texture
A yogurt-flavored gummy containing GABA, which is welcome when you want to calm down. You can enjoy a chewy, resilient texture similar to “mochi,” which is popular in Japan. Its gentle flavor helps ease tension and brings a moment of relaxation.
These gummies are cleverly designed with variations in not only flavor but also texture to prevent monotony before you finish the bag. However, these ingredients are intended to complement your mood, and this product is not a “Food with Function Claims.”
The Modern Lifestyle Behind the Development
In modern times, more and more people are studying and working without being tied to a specific time or place. The supervisor, Mr. Kono himself, says, “When I’m focused on studying or work, there are moments when I feel like I need a little change of pace.”
“RIRONE PERFECT GUMMY” was planned as a bite-sized item that can be easily picked up and eaten in various everyday situations. With its convenient, portable packaging, it supports your “thinking time” during study or work breaks, rest periods, or while on the go.
Product Information and Promotion
Product Name: RIRONE PERFECT GUMMY
Release Date: Tuesday, December 16, 2025
Reference Price: 248 JPY (tax included)
Where to Buy: FamilyMart stores across Japan
To commemorate the launch, a special movie has been released on Gento Kono’s YouTube channel, “Stardy – Gento Kono’s God-Tier Lessons.” It’s a video that conveys the product’s concept, so be sure to check it out.
About the Supervisor, Gento Kono, and the “RIRONE” Brand
Gento Kono is not only known for his incredible intellect but also boasts immense popularity as an educational YouTuber. His channel has over 1.69 million subscribers (as of December 2025), and his continuous dedication to learning and taking on new challenges has garnered support from many people.
His brand, “RIRONE,” operates under the concept of “pursuing the logically optimal solution for everyone who continues to learn.” It develops highly functional products that can be used not only by students but also by working adults, and this new gummy can be said to embody that philosophy.
This new product, found in Japanese Konbini, is a little unusual but exceptionally well-thought-out. When you visit Japan, why not pick it up and give it a try?
Source (Japanese): 【新商品】“考える時間”に寄り添う『RIRONE PERFECT GUMMY』 12月16日(火)より全国ファミリーマートで発売開始
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