[Help] How to rip image from Japanese e-book sites?

[FluFu]

Hi guys

I wonder if any of you how about C++, python or Javascript. I know nothing about these. But I found some sort of script/program (I don't even know what it is lol) on github and greasyfork that can rip images from DMM, DLsite, cmoa and Bookwalker.

I'm not sure if I can share those links here or not. If I can please tell me and I'll edit this post.

And please teach me how to rip the images.

Thanks!!