/jp/ - Otaku Culture

To anons who bought the photobook: is there a way to get the whole untouched epub file from the grajapa reader app? Their """DRM""" is hilarious, so ripping it should be simple.
So far I've come to the conclusion that it streams content from the net and saves it in the AppData/Roaming/bookend-viewer/Cache directory. The files inside are mostly JPGs ("f_xxxxxx", where xxxxxx is a hex number; without the extension), plus an xml with the epub structure and some data files.
The pics are hardly in order and I think incomplete, though that could probably be remedied by clearing the cache and going through the pb slowly and in order.