Do you remember what Ryo said when he was asked the reason for going to Bailu village
by one of the kids in Guilin? He said "Oni taiji (Ogre extermination)" in Japanese.
And, he was in trouble to explain what he meant exactly as there was a cultural gap.
What he said was based on "Momotaro (Peach boy)," one of the Japanese folklores.
Check Wikipedia: http://en.wikipedia.org/wiki/Momotaro
Here's the whole story: http://www.geocities.co.jp/HeartLand-Ga ... /momo.html
BTW, the typical "Oni" looks like this (disregard the woman in the right picture):