Princess Nine, known in Japan as Princess Nine Kisaragi Girls High Baseball Club (プリンセスナイン如月女子高野球部, Purinsesu Nain Kisaragi Joshikō Yakyū-bu), is a 26-episode Japanese anime television series and a three volume manga written and created by Kensei Date.

Their aim to qualify for, and ultimately to win, the final rounds of the tournament which is held each year at the Koshien Stadium.

They are led by ace pitcher, Ryo Hayakawa, a daughter of a former pitching star in Japan who was banned from Nippon Professional Baseball.

In addition to the nine players, there are two more members: The series was produced by Phoenix Entertainment, and aired from April 8 to October 14, 1998 on NHK.

[2] At Anime Expo 2013, Right Stuf Inc. had announced that they have licensed the series for a 2014 release under their Lucky Penny label.