Like most RPG's, in
Final Fantasy Crystal Chronicles: Echoes of Time, you play as a hero who's just come of age to be considered an adult. You have grown up in a village hidden deep in the forest away from all others. In fact, people in the surrounding towns consider the forest to be haunted and don't really even know there's a village there.
The story starts out on the day of your sixteenth birthday, the day you are considered an adult. After you complete your trials to earn your new status, a village child suddenly falls sick. There is no medicine in the village for the mysterious "Crystal Sickness," so you must travel to the neighboring village to find help. Getting the medicine is just the beginning of your journey, though. Once out into the world, you will have to find your own way. To do that, you'll need to wander around from place to place and talk to everyone you meet.
There are a lot of different things that you can do other than the main story in Echoes of Time. I recommend talking to everyone you meet multiple times since it can spark new quests for you. Quests are something that you do not have to do to complete the main story, but they can be quite a bit of fun and you will get some good items from some of them.
You can also have multiple characters in your party, up to 4 people total. You can control only one at a time, but you can swap between them very easily during battle. This makes it so that you can have one of each of the four races: the Clavats, the Yukes, the Lilties, and my favorite, the Selkies. I highly recommend you keep one of each simply because each race has their own particular benefits that you will end up needing to complete some puzzles. You can also play multiplayer with other players on DS or the Wii. Being able to play with a friend that you might not get to see is a great added bonus! I also really liked the fact that you can play multiplayer with people on the Wii as well. The only catch is that if you are playing with someone on the Wii and someone on the DS, the Wii has to be the host.