Every convenience store in Japan has a freezer, and every freezer runs the same lineup. Walk into a 7-Eleven in Sapporo or a Lawson in Naha and the ice cream is mostly identical, the same handful of brands that have sat there for decades. That sameness is the point. These are not seasonal, not regional, not hard to find. They are the standards. Here is what to pull out of the freezer.
Gari-Gari Kun
The blue one up top. Gari-Gari Kun is a soda-flavored shaved-ice popsicle made by Akagi, it costs about 70 yen, and it is the most democratic dessert in the country. The name is the sound of biting it, gari gari, the crunch of the ice. Kids eat it. Construction workers eat it. The stick sometimes says atari on the bottom, a winner, good for a free one. It is a Japanese summer reduced to a single object.
Choco Monaka Jumbo
The one you asked about, and the right one to ask about. Morinaga's Choco Monaka Jumbo is vanilla ice cream inside a crisp wafer monaka shell, with a thin slab of chocolate running down the middle so every bite has the crunch. The genius is the engineering. That chocolate layer is a moisture barrier, keeping the wafer from going soggy against the ice cream, so the shell stays crisp to the last bite. People have opinions about the optimal angle of attack. It is that kind of food.
Pino
Pino is six little chocolate-coated cones of ice cream in a box, eaten with the tiny plastic pick that comes inside. Morinaga again. The box rotates flavors, matcha and strawberry and whatever the season is doing, but chocolate is the original. It is the sharing one, except nobody shares it. The whole appeal is that each piece is one perfect bite, which means the box is gone in about ninety seconds, which is the problem with Pino and also the entire reason it works.
Parm
If Pino is the snack, Parm is the grown-up version. A chocolate-coated stick bar, but the ice cream is denser, the chocolate is thicker, and the whole thing tastes more expensive than it is. Morinaga owns this freezer, in case you have not noticed. Parm is what you buy when you want to feel like you chose well.
Yukimi Daifuku
Now Lotte. Yukimi Daifuku is two small balls of vanilla ice cream wrapped in soft mochi, eaten with a tiny two-pronged fork. The name means snow-viewing, and the joke is that it sells year round, including deep winter, when eating cold mochi ice cream in a heated room is somehow exactly right. The texture is the whole thing. Cold and chewy and soft, all at once.
Coolish
One more, and it has no picture because it does not hold still. Coolish, also Lotte, is ice cream in a pouch that you squeeze and drink, a frozen milkshake through a small hole in the top. It is built for the walk, the bike, the one free hand. You do not sit down with a Coolish. You drink it moving, which is the most Japanese way to eat anything.
The rule
None of these are rare. That is what I like about them. The weird machines are worth the detour, but the konbini freezer is worth knowing cold, because it is the same everywhere, it is always open, and it never disappoints. Learn this handful and you can walk into any store in Japan, in any city, at any hour, and walk out two minutes later with something good. Some of it even comes from a machine.