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Hentai Mag featuring 4 pages with 8 bones each and two flexes to crumple via length and width.
Tip: use the flexes lightly to help simulate paper bends as it used.
Modding skins is easy too, each book has one skin file with all its pages laid out in order.
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BTW if you know the names of the doujin artist feel free to add them to the comments.