3rd party tool that can generate a list related articles for a japanese-language site

I run a site with a large number of news articles. I'm looking for a 3rd party tool(or widget) that, when placed on an article page, would generate a list of related articles within the same site.

So my requirements are:

• Returns a list of links to related articles
• Has to be integrated front-end (javascript,ajax,etc)
• Has to sustain large traffic and display results quickly
• Most importantly, must 开发者_运维百科support Japanese language content

Any ideas on tools, widgets, services out there would be great - thanks!

nRelate has this exact product as a simple WordPress plugin - used both for related content and for most popular content.

http://nrelate.com/install-products/

Gravity also does something similar, but I believe you have to be a large website to gain access to their tools.

http://www.gravity.com/publishers