Dude, it's simple. Just download GARbro from here:
You must be registered to see the links
After you install it, open it. Click file, open. Find the folder where you installed the Majikoi visual novel and then open the Visual.pac file.
You'll see a big list of images. You can then click on any one of them, and you'll get a preview on the right side. Right clicking on the image name will give you a menu. Just click extract and then choose a folder where you want to extract them. It's that simple. I just did it. It takes like 1 minute to do.