Cross Game (クロスゲーム, Kurosu Gēmu) is a romantic comedy baseball manga series by Mitsuru Adachi that was serialized by Shogakukan in Weekly Shōnen Sunday between 11 May 2005 (issue 22/23) and 17 February 2010 (issue 12). It is collected in 16 tankōbon volumes as of November 2009[update], with the final volume scheduled to be published in April 2010, coinciding with the end of the anime. It received the 54th Shogakukan Manga Award for shōnen manga in 2009, and has been praised internationally as quietly brilliant and a great success. The series was adapted as a 50-episode anime television series that began airing on the TV Tokyo network on 5 April 2009 and will finish airing on 28 March 2010. The first episode of the anime, which covers the time frame of the first volume of the manga, received high praise, even outside of Japan.
Cross Game is the story of Kō Kitamura and the four neighboring Tsukishima sisters, Ichiyō, Wakaba, Aoba, and Momiji. Wakaba and Kō were born on the same day in the same hospital and are close enough that Wakaba treats Kō as her boyfriend, though nothing is officially declared, while Aoba, one year younger than them, hates how Kō is "taking" her sister away from her. After Wakaba dies, Kō and Aoba slowly grow closer as they strive to fulfill Wakaba's final dream of seeing them play in the high school baseball championship in Kōshien Stadium.
The manga is divided into multiple parts. Part One, which consists of volume one, is a prologue that takes place while the main characters are in elementary school, ending with Wakaba's death. Part Two starts four years later with Kō in his third year of junior high and continues into the summer of his third year of high school. Part Three continues the story without a break, ending with Kō and Aoba traveling to Kōshien.