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Players take control of high school baseball team in Japan, either as a player on the team or as a manager, and attempt to lead that team to the National High School Baseball Championship at Koshien Stadium.
They are organized by the Japan High School Baseball Federation in association with Mainichi Shimbun for the National High School Baseball Invitational Tournament in the spring (also known as "Spring Kōshien") and Asahi Shimbun for the National High School Baseball Championship in the summer (also known as "Summer Kōshien").