It’s a Pepsi that is intended to pair well with fried chicken.

Quote: “It has a lessened sweetness and not quite as sharp cola taste to allow eaters to more fully appreciate karaage flavor, and also contains dietary fiber to help cut through the fatty and oily nature of fried chicken.”

Source: https://japantoday.com/category/features/food/new-pepsi-designed-to-specifically-pair-with-fried-chicken-released-in-japan-1