This it like the most difficult engine ever in my opinion. (Games like Euphoria, Pajama-san Konnichiwa etc)
There's no information about it on tlwiki and so on.
The only thing I found was this on archive.foolz.us:
1). Get AnimED (http://wks.arai-kibou.ru/ae.php?p=dl)
2). Open those .ypf files with the archive tool.
3).Go to the Data Tool, and on the dropdown select XOR
4).Press Bruteforce Bytes, and select a small .ybn file from the now extracted .ypf file.
5).Go through all the files (