Someone knows what is the purpose of making different ads for Eastern and Western Japan?
Might be because of culture difference. Even though they are the same (Japan) but they have slightly different cultures in many aspects like religions, food, life style, etc. There are things acceptable in the west but not in the east, the reverse also goes. There have been talks about how the west and east side of the same religion consider each other enemy too, not that I know the details. Well, that's pretty much assumption on my part though.
