Kit Kat Premium Sweet Potato Limited Seasonal Special Edition is the latest KitKat item and is only available in Japan. Be one of the first to try the latest Japanese KitKat in your country. This product features chestnut powder in the wafer layer, and features “sweet sweet potato. You can enjoy the taste of autumn with a combination of crispy “Kit Kat” and autumn potatoes that give you a sense of feeling and smell. Limited Edition!