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Summer Wars
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You can stream Summer Wars (2009) on Max with a subscription.
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 is a film that explores themes of card game, artificial intelligence (a.i.), computer. It also touches on hacker and virtual reality and family holiday.
Trailer
Director
Mamoru Hosoda
Cast
Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura, Sumiko Fuji, Ayumu Saito, Takahiro Yokokawa, Kiyomi Tanigawa, Mutsumi Sasaki, Mieko Nobusawa, Takuya Kirimoto
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Summer Wars
You can stream Summer Wars (2009) on Max with a subscription.
IMDb
7.5/10
RT Critics
81%
Metacritic
Director
Mamoru Hosoda
Cast
Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura, Sumiko Fuji, Ayumu Saito, Takahiro Yokokawa, Kiyomi Tanigawa, Mutsumi Sasaki, Mieko Nobusawa, Takuya Kirimoto
1 options ranked by value · 🇺🇸 United States
Keep browsing: New Releases · Popular Movies · Animation · Science Fiction
card game · artificial intelligence (a.i.) · computer · hacker · virtual reality · family holiday · adult animation · anime
Summer Wars is streaming on Max. Summer Wars is not currently available on Netflix, Hulu, Disney+, Prime Video, Apple TV+. Availability last verified April 9, 2026.