Girl Got Game Vol 1

Kyo Aizawa is very excited about getting to attend Seisyu Academy, which is famous for its adorable girls' uniforms. Her spirits are crushed, however, when she opens the package containing her school uniform to find a boy's uniform. Her father explains to her that, as Seisyu Academy is also famous for its boys' basketball program, he enrolled her as a boy so she can fulfill his own dream of becoming an NBA basketball star. To make matters worse, she has to stay in the boys' dorms, and her roommate is the same boy she came to hate at tryouts.

Source: Anime News Network Encyclopedia