Summer Wars
Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.
Top cast
Ryunosuke KamikiKenji Koiso (voice)
Hitomi MiyauchiNatsuki Shinohara (voice)
Mitsuki TanimuraKazuma Ikezawa (voice)
Sumiko FujiSakae Jinnouchi (voice)
Ayumu SaitoWabisuke Jinnouchi (voice)
Takahiro YokokawaTakashi Sakuma (voice)
Kiyomi TanigawaYukiko Shinohara (voice)
Mutsumi SasakiKazuo Shinohara (voice)
Mieko NobusawaMariko Jinnouchi (voice)
Takuya KirimotoRiichi Jinnouchi (voice)
Sakiko TamagawaRika Jinnouchi (voice)
Ichiro NagaiMansuke Jinnouchi (voice)
Below are the streaming services currently carrying the movie “Summer Wars” in the United States, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in the United States can differ from other countries.
Where to watch Summer Wars in United States
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Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 20 Sept 2026.