Is this the musical cheap knock-off of Dissidia?

I have to ask why its priced so high! Is that cuz of Japan only? or is there something extra that makes the game worth more?

Large(r) card + SE tax, most likely.

There's a lot more variance in pricing in Japan than there is here, and not usually in the direction we'd like to see.

This is not the most expensive 3DS game.
One of the launch title, Samurai Warriors Chronicles, is at the same price,
and New Love Plus, which was delayed to St. Valentine's Day in 2012, is priced at 6,980 yen (about $90), which costs even more than having a real girlfriend!?

Mental note: If wife Dies date in Japan.  Women are very cheap.

Anyways, $79 is absurd but,Square knows that this really appeals to a single niche that will pay that price for it and the chances of it breaking out of that niche is close to nill before it hits the bargain bin anyway.

I hope this game does get a US release, because the first few Final Fantasy games have the best music of the series.