These are the Kracie Nerunerunerune DIY Candy Kits, one of Japan's most famous and nostalgic "intellectual education" (Chiiku Kashi) snacks.
Launched in 1986, these kits are famous for the "magical" chemical reaction where adding water to the powder causes it to change color and swell into a fluffy, foam-like candy.
The "Magic" Foam: You start by mixing powder and water. As you stir, the mixture changes color (e.g., from yellow to blue) and expands into a light, airy foam.
The Toppings: Once the foam is ready, you dip your spoon into the included toppings for extra texture and flavor.
Educational & Safe: While it looks like a science experiment, it uses natural ingredients like citric acid and baking soda for the reaction. It is fortified with Calcium and contains no artificial colors or preservatives.
