Where to watch Summer Wars in the United States
Summer Wars (2009) is streaming on Max.
U.S. availability last verified
Summer Wars
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HD · Included
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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.
Sun-drenched nostalgia meets a neon-soaked digital apocalypse in this vibrant explosion of color and family chaos. A frantic race to solve a mathematical riddle becomes a heartwarming battle to save the world from a rogue artificial intelligence.
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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1 options ranked by value · 🇺🇸 United States
Included with subscription
Last verified 13 days ago
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
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Summer Wars is streaming on Max. We have not verified a current option on Netflix, Hulu, Disney+, Prime Video, Apple TV+. Availability last verified October 6, 2026.