The story centers on high school student Kenji Koiso, a wiz in mathematics but ill-adept socially, who spends his time in OZ, a massive computer-simulated virtual reality world, as a part-time low-end moderator. It was nominated for the 2009 Golden Leopard award at the Locarno International Film Festival, and won the 2010 Japan Academy Prize for Animation of the Year. Two manga adaptations of the film were published ahead of the film's release in Japan.

Audience interest was fueled primarily through word of mouth and Internet publicity. The project was first announced without a title at the 2008 Tokyo International Anime Fair, and the first trailer of the film was released in April 2009. It was produced by the Japanese animation studio Madhouse and directed by Mamoru Hosoda. The film focuses on a timid eleventh-grade math genius who has been falsely implicated in the hacking of a virtual world and, with the aid of an upper-classman's extensive family, must prevent the real and computer-simulated worlds from colliding.

Summer Wars (サマーウォーズ) is a 2009 anime science fiction film.

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