how do they do to have a website like this ?

[Jake]

That site has some features that you don't normally see on a free hosted site, including the integrated forum and floating registration, it would cost hundreds or thousands of dollars to have it recreated.

Here's an example of a design spec put up for bid by web site developers
http://www.freelancer.com/projects/PHP-W...clone.html

Try searching for: anime site clone script

To see predesignated starter web site designs.

Odds are some young Anime fan would be better of just using a simple free hosted blog platform like Google's Blogger.com or Wordpress.com, getting a custom name for about $12/year would provide the ability to change hosts without losing the name.

You should also read up on Copyright Law and how it applies to web sites.