^ I think that maybe an animated PV is a must, since the movie is a live action adaptation of the Yatterman anime after all. They need to have an animated PV to show with the theme song itself - to sell the movie. And Arashi fans wouldn't want an animated PV of Believe with animated characters. Hence the live action version PV with the members - to sell Arashi's single. In short, it's a marketing strategy.
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~Lovely set by Mary-Tina~
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