

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.
Where to watch Summer Wars in United States
Click a service to open Summer Wars there. Availability last verified on June 20, 2026.
Where is Summer Wars streaming around the world?
| Country | Streaming on | Rent / Buy |
|---|---|---|
| United States | HBO Max Amazon Channel, YouTube TV, HBO Max | Amazon Video, Apple TV Store, Google Play Movies |
| United Kingdom | — | Apple TV Store, Amazon Video, Sky Store |
| Canada | — | Apple TV Store |
| Germany | RTL+, RTL+ Max Amazon Channel | Apple TV Store, Amazon Video, maxdome Store |
| France | — | Apple TV Store, Canal VOD, VIVA by videofutur |
| Brazil | Filmelier Plus Amazon Channel | — |
| Japan | Netflix, Amazon Prime Video, Hulu, U-NEXT | Amazon Video, Apple TV Store, Google Play Movies |
| South Korea | wavve, Watcha, TVING | wavve |
About Summer Wars
Summer Wars is a 2009 Japanese-language animation and science fiction film directed by Mamoru Hosoda. The cast is led by Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura. It has a runtime of 1h 54m. Viewers rate it 7.5/10 across 1000 ratings. In United States, it is currently streaming on HBO Max Amazon Channel, YouTube TV, HBO Max.
Summer Wars was produced by Madhouse, Nippon Television Network Corporation, and KADOKAWA Shoten and made in Japan. It was released on August 1, 2009, and carries a PG certification. At the box office it grossed around $18 million worldwide.
- Director
- Mamoru Hosoda
- Writers
- Satoko Okudera
- Release date
- August 1, 2009
- Original language
- Japanese
- Age rating
- PG
- Status
- Released
- Country
- Japan
- Box office
- $18 million
- Production
- Madhouse, Nippon Television Network Corporation, KADOKAWA Shoten
Summer Wars cast & crew
Summer Wars was directed by Mamoru Hosoda and written by Satoko Okudera.
The cast features 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), and Takahiro Yokokawa as Takashi Sakuma (voice).
Behind the camera, the score was composed by Akihiko Matsumoto, cinematography is by Yukihiro Masumoto, and it was produced by Nozomu Takahashi and Takuya Ito.
Is Summer Wars worth watching?
Summer Wars holds an audience score of 7.5/10 from 1,037 ratings, marking it as well-reviewed animation films.
At 1h 54m, it's a standard feature-length watch.
If you enjoy animation and science fiction, Summer Wars is worth a place on your watchlist.
How and where to watch Summer Wars
In United States, you can stream Summer Wars on HBO Max Amazon Channel, YouTube TV, and HBO Max, or rent and buy it on Amazon Video, Apple TV Store, Google Play Movies, and YouTube. Click any service above to open it directly.
Streaming rights change country by country and month by month, so the options above reflect United States today — switch your country at the top of the where-to-watch section to see availability elsewhere.
Rate & review
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Cast of Summer Wars

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)

Sakiko Tamagawa
Rika Jinnouchi (voice)

Ichiro Nagai
Mansuke Jinnouchi (voice)
Summer Wars — FAQs
▸Where can I watch Summer Wars in United States?
Summer Wars is streaming on HBO Max Amazon Channel, YouTube TV, HBO Max in United States.
▸Is Summer Wars on HBO Max Amazon Channel?
Yes — Summer Wars is currently available on HBO Max Amazon Channel in United States.
▸What language is Summer Wars in?
Summer Wars is originally in Japanese. Subtitle and dub options vary by streaming service.
▸How long is Summer Wars?
Summer Wars runs 1 hours 54 minutes (114 minutes).
▸What is Summer Wars rated?
Summer Wars is rated PG. It holds a 7.5/10 audience score from 1,037 ratings.











