Like all Tales games for the Playstation 2 console, the story is a bit hard to explain because it has so many twists and turns. The main character is a boy named Luke fon Fabre. He was kidnapped as a child (and subsequently returned to his family), but his memories of life before the kidnapping are gone. After he was returned, he was kept confined in his family's manor and was not even allowed in the city beyond its gates.
However, all of that changes when a strange woman appears and tries to kill his mentor. In an attempt to stop her he uses a power he didn't even know he had to transport them halfway around the world. The journey back to his home is only the beginning of a much larger quest that eventually comes down to saving the world. I can't really say anymore without giving away some massive spoilers!
You are just going to have to trust me when I say the plot is good and the story is engaging. Luke really grows from an arrogant selfish brat into a commendable young man.
However, just following the story-line you may miss out on some vital plot information. It is best to do all the side quests as well if you want the whole story.