Download video from Crunchyroll using netvideohunter, is no longer working. It seem that Crunchyroll disabled video download using downloadhelper, netvideohunter, and any other tools.
Some site still offer web converter and download tools. But, only some of them are not free.

Here is the list you can try:
1. http://clipnabber.com/
2. VideoGet – http://nuclear-coffee.com/php/how-to-download-video-from-CrunchyRoll
3. Tube Hunter – http://www.neoretix.com/ 
4. http://applian.com/

if you found one, please share with us. Thanks.

Update: try http://www.keepvid.com
Just copy paste the crunchyroll link (the one with .html)

Cruncyroll is one of the most popular youtube like website. One thing that made Cruncyroll very popular is because its focus in Japanese product like drama, music video clip, game video clip, and Anime. Because nowadays, we can’t hardly find good quality in Youtube due to license violation.

The challenge is, how to download videos from Crunchyroll? If you are a Firefox user, this method will work for you, otherwise, get Firefox.

Some people suggest to use Downloadhelper, but some report that it won’t work. This happened to me also, Downloadhelper won’t work. So, after I do some research, I found a Firefox add-on called NetVideoHunter. You can download it from here.

The usage is also as simple as Downloadhelper, but NetVideoHunter is more flexible, since it is also can handle those site that block Downloadhelper, such as RedTube, etc. 

Thus, you can use NetVideoHunter to download from any Youtube like website, such as: MegaVideo, Crunchyroll, etc.

Good luck! ;)