Take PlayStation RPG epic Final Fantasy VII, knock it down to 8-bits, translate it to Chinese, and then throw it on a cartridge, and you'll have something like this somewhat collectible piece of crap. It's got Advent Children branding, though it has nothing to do with the movie. That's just how Chinese rip-offs work.
This one is in new condition, and has only been played once. A mere $2.25 could buy you one of the darkest parts of gaming's history. I don't expect that it will go for much. It would make a kickass gag gift, I think.
I love the screenshot above. Is that Cloud?