Cross Game (クロスゲーム, Kurosu Gēmu) is a manga series by Mitsuru Adachi that was serialized by Shogakukan in Weekly Shōnen Sunday between May 11, 2005 (issue 22/23) and February 17, 2010 (issue 12). It is collected in 17 tankōbon volumes, with the final volume published in April 2010, shortly after the end of the anime series. 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 aired on the TV Tokyo network from April 5, 2009 to March 28, 2010.
The main character is Kou Kitamura, son of the owner of Kitamura Sports. In the same neighborhood is a batting center run by the Tsukishima family. Due to their proximity and the relationship between their businesses, the Kitamura and Tsukishima families have been close for many years, with their children going back and forth between the two homes like extended family. Because Kou and Wakaba were the same age and always together, Aoba was jealous of all the time Kou spent with her older sister. Aoba is a natural pitcher with excellent form, and Kou secretly trains to become as good as she was, even while publicly showing little interest in baseball.