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.
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Cast
28 people
Ryunosuke Kamiki
Kenji Koiso (voice)
Known for
Your Name.
Godzilla Minus One
Hitomi Miyauchi
Natsuki Shinohara (voice)
Known for
Attack on Titan
Manhunt
Mitsuki Tanimura
Kazuma Ikezawa (voice)
Known for
The Girl Who Leapt Through Time
Ace Attorney
Sumiko Fuji
Sakae Jinnouchi (voice)
Known for
Air Doll
Children of the Sea
Ayumu Saito
Wabisuke Jinnouchi (voice)
Known for
Ju-on: The Grudge 2
Marebito
Takahiro Yokokawa
Takashi Sakuma (voice)
Known for
Summer Days with Coo
Kiyomi Tanigawa
Yukiko Shinohara (voice)
Known for
The Girl Who Leapt Through Time
Mutsumi Sasaki
Kazuo Shinohara (voice)
Known for
Dororo
My Dress-Up Darling
Mieko Nobusawa
Mariko Jinnouchi (voice)
Known for
Kiki's Delivery Service
Future Boy Conan
Takuya Kirimoto
Riichi Jinnouchi (voice)
Known for
The Apothecary Diaries
Devilman Crybaby
Sakiko Tamagawa
Rika Jinnouchi (voice)
Known for
Samurai Champloo
Ghost in the Shell: Stand Alone Complex
Ichiro Nagai
Mansuke Jinnouchi (voice)
Known for
Dragon Ball Z
Warriors of the Wind
Mamoru Hosoda Director · Satoko Okudera Screenplay Akihiko Matsumoto Composer
Worldwide gross $18M · United States release October 13, 2010 · Produced in Japan
Box office
Worldwide gross
$18,434,328
Production
Madhouse
Production
Nippon Television Network Corporation
Production
KADOKAWA Shoten
Production
D.N. Dream Partners
Production
Warner Bros. Japan
Production
Yomiuri Telecasting Corporation
Production
VAP
Production
Studio Chizu
Production
Warner Bros. Pictures
Studio
Japan
Produced in
Languages
Original title
サマーウォーズ
Original language
Japanese
Spoken on screen
Japanese
Release dates
Japan · August 1, 2009
Theatrical
United States · October 13, 2010
Theatrical
United States
July 27, 2025 · Limited theatrical · 4K remaster
Australia
April 20, 2010 · Theatrical
Brazil
July 27, 2025 · Digital
Finland
February 25, 2011 · Theatrical
France
June 9, 2010 · Theatrical
Germany
February 16, 2010 · Theatrical
Hong Kong SAR China
October 24, 2009 · Premiere · Hong Kong Asian Film Festival
December 11, 2025 · Limited theatrical · 4K restoration & 4DX
Ireland
February 12, 2011 · Theatrical
Italy
November 3, 2010 · Physical · DVD / Blu-ray
Mexico
October 10, 2009 · Digital
Netherlands
November 15, 2010 · Physical · DVD
May 7, 2026 · Theatrical · 4K restoration
Panama
May 14, 2026 · Theatrical
Poland
April 4, 2011 · Physical · DVD
May 8, 2026 · Limited theatrical
South Korea
August 13, 2009 · Theatrical
Spain
July 16, 2013 · Theatrical
Sweden
May 7, 2026 · Theatrical
Switzerland
August 12, 2009 · Theatrical
Taiwan
June 4, 2010 · Theatrical
August 10, 2018 · Theatrical · Digital re-release
January 17, 2020 · Theatrical · 4DX
United Kingdom
February 12, 2011 · Physical
July 6, 2025 · Limited theatrical · 4K remaster
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Some details come from TheTVDB.