Movie
Summer Wars
Always protect your network.
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.
Streaming, rental and purchase options
Where to watch in United States
Checked Sep 2, 2026
Summer Wars is available to stream on HBO (Via Hulu), HBO Max, and HBO Max (Via Amazon Prime) in United States. You can also rent or buy it from Amazon, Apple TV, and Fandango at Home. Use the direct links below to open the provider.
Synopsis
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.
More about Summer Wars
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)Credits
- Directed by
- Mamoru Hosoda
- Written by
- Satoko Okudera
Production details
- Status
- Released
- Original language
- Japanese
- Original title
- サマーウォーズ
- Box office
- $18.4M
Production
MadhouseJapan
Nippon Television Network CorporationJapan
KADOKAWA ShotenJapan
D.N. Dream PartnersJapan
Warner Bros. JapanJapan
Yomiuri Telecasting CorporationJapan
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