You'll have to contact them. I can't read their web site, as the language is not English or Chinese, but if you can find it, just look for their contact email, postal address or phone number and ask for permission.
Their site: http://www.xilam.com/xilam/home.html
Normally, they wouldn't let you because it comes down to control over the assets and representation. For example, the company I used to work with would right off the bat reject everyone who wants to create games after our characters unless they were hired by us or partnered with us for that specific purpose.
However, you should still give it a try. You never know if a company like them would want some extra exposure.ginsengsamurai2011-10-26 22:22:40