Skip to content
SearchOTT
Summer Wars poster

Summer Wars

2009·Movie·PG·114 min·7.5(1,037)

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.

▶ Watch trailer

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?

CountryStreaming onRent / Buy
United StatesHBO Max Amazon Channel, YouTube TV, HBO MaxAmazon Video, Apple TV Store, Google Play Movies
United KingdomApple TV Store, Amazon Video, Sky Store
CanadaApple TV Store
GermanyRTL+, RTL+ Max Amazon ChannelApple TV Store, Amazon Video, maxdome Store
FranceApple TV Store, Canal VOD, VIVA by videofutur
BrazilFilmelier Plus Amazon Channel
JapanNetflix, Amazon Prime Video, Hulu, U-NEXTAmazon Video, Apple TV Store, Google Play Movies
South Koreawavve, Watcha, TVINGwavve

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
#card game#artificial intelligence (a.i.)#computer#hacker#virtual reality#family holiday#adult animation#anime

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

Your rating and review are saved privately in this browser — no account needed.

Cast of Summer Wars

Ryunosuke Kamiki

Ryunosuke Kamiki

Kenji Koiso (voice)

Hitomi Miyauchi

Hitomi Miyauchi

Natsuki Shinohara (voice)

Mitsuki Tanimura

Mitsuki Tanimura

Kazuma Ikezawa (voice)

Sumiko Fuji

Sumiko Fuji

Sakae Jinnouchi (voice)

Ayumu Saito

Ayumu Saito

Wabisuke Jinnouchi (voice)

Takahiro Yokokawa

Takahiro Yokokawa

Takashi Sakuma (voice)

Kiyomi Tanigawa

Kiyomi Tanigawa

Yukiko Shinohara (voice)

Mutsumi Sasaki

Mutsumi Sasaki

Kazuo Shinohara (voice)

Mieko Nobusawa

Mieko Nobusawa

Mariko Jinnouchi (voice)

Takuya Kirimoto

Takuya Kirimoto

Riichi Jinnouchi (voice)

Sakiko Tamagawa

Sakiko Tamagawa

Rika Jinnouchi (voice)

Ichiro Nagai

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.

More like Summer Wars

Napping Princess
Expelled from Paradise
Cosmic Princess Kaguya!
Hello World
Barbie Video Game Hero
Doraemon: Nobita and the Space Heroes
Roujin Z
Crayon Shin-chan: Honeymoon Hurricane ~The Lost Hiroshi~
Pokémon Ranger and the Temple of the Sea
Crayon Shin-chan: A Storm-Invoking Jungle
The Imaginary
Barbie: Skipper and the Big Babysitting Adventure
Summer Wars (2009) — where to watch online · SearchOTT