The domain primehentai.com has no malware on it. “Juicyads” who is an adult ad network was attacked with a malicious code from some hackers and therefor many of the adult sites (like primehentai) who use their ads have been marked as harmful sites.
However, the problem has been fixed now.
November 9, 2014
Congratulations! Google has received and processed your malware review request. We did not detect any malware on your site.
As a result, we’re removing the malware warning from your site. This may take some time to happen. (You can check the status of your malware review at any time using Webmaster Tools.)