The Coca-Cola Company in Japan produces a lot of regional items that are difficult to find in other countries. Many brand new Coca-Cola products are first tested in Japan, long before they enter other markets.
For example, when Coca-Cola wanted to get into the alcohol business, they developed a very popular range of lemon alcoholic drinks for the Japanese market, which have yet to spread abroad.
Coca-Cola often creates new flavours of their popular products for international markets, such as the extremely popular grape flavor of Fanta. In addition, their sports and health drinks and supplements are very popular in Japan, with the Aquarius rehydration sports drink being a staple of matches and sporting events nationwide.