Pepsi's Strong Zero soda — a zero-calorie cola boasting increased amounts of caffeine — was the biggest soft-drink release of the week. But it's really a tasteless beverage that will give you a bellyache. So let's focus on a pleasant alternative, available only at FamilyMart.

The Pokka Sapporo Cola Float (¥150) is back, and not only features an adorable penguin on the packaging, but has a flavor uncommon in Japan: vanilla cola. It doesn't go overboard in that regard, the vanilla is subtle enough that it doesn't feel as though you are drinking a bowl of melted ice cream with cola poured into it. Forget about extra energy, go for vanilla cola — while it lasts.