Summer Wars
Directed by Mamoru Hosoda
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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Top cast
Ryunosuke Kamiki
Kenji Koiso (voice)
Hitomi Miyauchi
Natsuki Shinohara (voice)
Mitsuki Tanimura
Kazuma Ikezawa (voice)
Sumiko Fuji
Sakae Jinnouchi (voice)
Ayumu Saito
Wabisuke Jinnouchi (voice)
Takahiro Yokokawa
Takashi Sakuma (voice)
Kiyomi Tanigawa
Yukiko Shinohara (voice)
Mutsumi Sasaki
Kazuo Shinohara (voice)
Mieko Nobusawa
Mariko Jinnouchi (voice)
Takuya Kirimoto
Riichi Jinnouchi (voice)
Frequently asked questions
Where can I watch Summer Wars online?
As of August 6, 2026, Summer Wars is available to stream on HBO Max Amazon Channel, YouTube TV, and HBO Max in United States. Use the country selector above to check availability in other regions — streaming rights are licensed per country, so catalogues differ.
Is Summer Wars on Netflix?
No — Summer Wars is not currently on Netflix in any of the countries we track. In United States it streams on HBO Max Amazon Channel, YouTube TV, and HBO Max instead.
Can I rent or buy Summer Wars online?
Yes. In United States, Summer Wars can be rented on Amazon Video, Apple TV Store, Google Play Movies, YouTube, and Fandango At Home and purchased on Amazon Video, Apple TV Store, Google Play Movies, YouTube, and Fandango At Home.
In which countries can I stream Summer Wars?
As of August 6, 2026, Summer Wars is included with a streaming subscription (or free with ads) in Brazil, Chile, Colombia, Germany, Italy, Mexico, Russia, Spain, and United States, among the countries we track.
Streaming availability last checked on August 6, 2026. Catalogues change frequently — data from TMDB and JustWatch.
