Here is an overview of the game, via Nintendo.com:

About

Sports Story is a sports RPG like no other. Featuring a mix of sports and sporting activities wrapped up in one big story. With a multitude of characters to meet, you will make plenty of friends and enemies along the way. Sports Story isn’t just about sports, it’s an all-out sporting adventure.

Key Features

• Play and master eight unique golf courses. Rise through the ranks of the tennis world tour. Start your own soccer team. Your sporting destiny is in your own hands.
• Travel by train, helicopter and houseboat as you explore dungeons, abandoned ruins and the mysterious Wildlands.
• Raise your Sporting Rank to unlock new and varied activities like BMX, mini-golf, cricket, volleyball, fishing, and more.
• Kick back at the mall with its daily attractions, specialty sports stores and mini games.