TDark Angel is perfect if you're into cute Japanese babes and don't want to pay for porn. It's a blog style designed site that is quite easy to use. You load the page and everything is laid out in date order. If you notice the pagination near the top you'll see there are over 1000 pages too so plenty of Japanese porn to work your way through.
Each update has a continue reading button underneath an image thumbnail and some brief text. If you click this, you'll see further detail with download links where many of the downloads use file paradox or ryushare. You can simply click on one of these links and download Japanese porn direct to your hard drive.
On the right hand side there is what is known as a tag cloud where most popular tags are displayed and if you click on them they will give you all of the matching entries in that category. Archives are also available and these go back to August 2010.