The story of the Southern Continent's Wailing Grotto was a famous one. Many couples would come over here to rendezvous after learning the story, as a sign of remembrance to the couple of the story.
About a thousand years ago, there was a country called Fetched Moon Country. Because the royal bloodline was growing thin, no one could control Fetched Moon Country's national divine weapon, Fire Dragon Sword, and ultimately it led this country to its demise. The other countries around were looming over and were very close to devouring this country.
In order to save his citizens who were in hot water, the young Fetched Moon Country's prince, Thunder took the Fire Dragon Sword and traveled the world to train and learn, in an attempt to gain control over Fire Dragon Sword.