This snack is called Ninja Meshi, Ninja Food , “for the modern ninja”. They are umeboshi and katsuobushi flavored gummies. I guess they are for modern ninjas because they provide a quick energy boost and don’t make any sound when you’re chewing on them during your clandestine assignments. 🤔 They come in resealable bags, so you can carry them around stealthily.
Ninja Meshi is made by UHA Mikakuto, who certainly show a quirky sense of humor in their product naming and marketing. They also make the miniaturized korokke snacks I featured some time ago.