Sixteen-year-old Kyou Aizawa's relationship with her father has always revolved around basketball. He wanted to join the NBA, but suffered a knee injury that ended his dream; since then, he has tried to live vicariously through Kyou. When her father suddenly gets transferred to another part of the country, Kyou gets the opportunity to attend Seisyu Academy. She is excited because Seisyu is famous for its cute girls' uniforms. When she opens the box sent by the school, however, Kyou discovers an unflattering boys' uniform instead!

As it turns out, her father has faked paperwork and enrolled her as a male student so she can join the school basketball team, which is ranked fourth in Japan. As a sacrifice to carry on her father's legacy, Kyou begrudgingly cuts her hair and moves into the boys' dormitory. She meets her roommate and teammate Chiharu Eniwa but somehow manages to irritate him on the very first day. He is quick to taunt Kyou about her short stature and questions her dedication to the sport. Will Kyou be able to live in close quarters with someone so annoying and thrive on the basketball team, all while hiding her true gender from everyone?