One of my biggest interests with manga is that it is the closest medium to film in print. There are lots of comic adaptations of films around there (mostly shit and cut to 48 pages with very few exceptions)
However in Japan, you had manga adaptations not of children's related movies but ANY film that you can think of and obviously there would be differences.
But as you can imagine, most of these manga can't even be reprinted anymore so most of them may be as well lost.
What can we get from a Planet of the Apes manga that a comic couldn't offer?
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Or a Ben-Hur manga?
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It is just a curious thing, tie in media that is disposable to anyone but a very few people in a single island.
I still want to read the Waterworld, King Kong and Tron manga lol