Sixteen-year-old Kyou Aizawa's relationship with her father has always centered on basketball. He aspired to join the NBA, but a knee injury ended his dream; since then, he has attempted to live vicariously through Kyou. When her father is suddenly transferred to another part of the country, Kyou gains the opportunity to attend Seisyu Academy. She is thrilled because Seisyu is renowned for its cute girls' uniforms. However, when she opens the box sent by the school, Kyou finds an unflattering boys' uniform instead! It turns out that her father forged paperwork and enrolled her as a male student so she could join the school basketball team, which is ranked fourth in Japan. As a sacrifice to carry on her father's legacy, Kyou reluctantly 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?