サマーウォーズ
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.
Summer Wars (2009) is a animation and science fiction film directed by Mamoru Hosoda, released on August 1, 2009 with a runtime of 1h 54m. It stars Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura and Sumiko Fuji. Viewers rate it 7.5 out of 10 across 1,065 ratings.
Watch the official trailer for Summer Wars before you stream it.
Official trailers, teasers, clips and featurettes for Summer Wars.
Trailer
Trailer
Ryunosuke Kamiki
as Kenji Koiso (voice)
Hitomi Miyauchi
as Natsuki Shinohara (voice)
Mitsuki Tanimura
as Kazuma Ikezawa (voice)
Sumiko Fuji
as Sakae Jinnouchi (voice)
Ayumu Saito
as Wabisuke Jinnouchi (voice)
Takahiro Yokokawa
as Takashi Sakuma (voice)
Kiyomi Tanigawa
as Yukiko Shinohara (voice)
Mutsumi Sasaki
as Kazuo Shinohara (voice)
Mieko Nobusawa
as Mariko Jinnouchi (voice)
Takuya Kirimoto
as Riichi Jinnouchi (voice)
Sakiko Tamagawa
as Rika Jinnouchi (voice)
Ichiro Nagai
as Mansuke Jinnouchi (voice)
Directed by Mamoru Hosoda, written by Satoko Okudera and Mamoru Hosoda, produced by Nozomu Takahashi, Takuya Ito and Yuichiro Saito.
Average viewer score of 7.5/10 from 1,065 ratings.
It’s really quite apposite to watch this film at a time when governments across the world are merrily acquiescing to the demands of global tech to facilitate the rampant advance of AI. This story quite cleverly illustrates just how easily a collection of “Will Hunting” types can be used to crack even the most complex (2,000 digit) numeric code and allow nefarious access to a global network which manages just about…
Reviewed on August 6, 2025
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Summer Wars (2009) is available to stream on HBO Max Amazon Channel and HBO Max, and to rent or buy from Amazon Video, Apple TV Store, Google Play Movies, YouTube and Fandango At Home. Streaming availability is checked against JustWatch data and can change by region.
The main cast of Summer Wars (2009) includes Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura, Sumiko Fuji and Ayumu Saito. The film was directed by Mamoru Hosoda. You can see the full cast and crew list, with character names, further up this page.
Summer Wars was released on August 1, 2009 and runs for 1h 54m.
Summer Wars (2009) holds an average rating of 7.5 out of 10 from 1,065 viewer votes, and is a good pick if you enjoy animation and science fiction films. Read the viewer reviews on this page to decide for yourself.
Yes. The official Summer Wars trailer is embedded in the trailer section of this page and plays instantly, no download or sign-up required.
