Originally Posted by Wikipedia

Girl Got Game (originally published in Japan as Power!!) is a manga drawn by Shizuru Seino about a girl forced to pretend to be a boy.
Kyo Aizawa is a girl whose father is crazy about basketball. His dream was to go as far as the NBA, but, because of an injury, he couldn't. So, when they moved, he enrolled his daughter Kyo in Seisyu High School, which was famous for two things — cute girl uniforms, and a fast and furious boys basketball team. When Kyo got her uniform, she is shocked to discover, not a cute girl uniform, but a guy's outfit. Only then does she discover her father's plan, to get her in Seisyu as a boy to play on their top-ranked team!
The story, rather than being centered on basketball, is mainly about Kyo, and how she begins to like her male roommate Chiharu Eniwa. The story proceeds quite fast and by the end of the first volume, he is going to find out her secret. Kyo has some explaining to do to hide her true gender. But, eventually, Chiharu finds out. The manga (originally published in Japan by Kodansha) has been translated into English and is available in North America from TOKYOPOP which in August 2005 completed the domestic translation of all 10 volumes.
While the story is not centered on basketball, the manga's English title is clearly connected to the Spike Lee film He Got Game.