Summer Wars
サマーウォーズ
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.
Ratings
Based on audience scoresWhere to stream Summer Wars
Streaming now in the United States on HBO Max.
Rent or buy in the United States on Amazon Video, Apple TV Store, Google Play Movies, YouTube, and Fandango At Home.
Trailers and promos
Official Trailer [Subtitled]
Official English Trailer
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Frequently asked questions about Summer Wars
Where can I watch Summer Wars in the United States?
Summer Wars is available to stream on HBO Max in the United States, and to rent or buy on Amazon Video, Apple TV Store, Google Play Movies, YouTube, and Fandango At Home. Streaming availability is provided by JustWatch and can change over time.
Is Summer Wars on HBO Max?
Yes. Summer Wars is streaming on HBO Max in the United States.
Can I watch Summer Wars for free?
Not free in the United States right now. Summer Wars needs a subscription to HBO Max, or you can rent or buy it on Amazon Video, Apple TV Store, Google Play Movies, YouTube, and Fandango At Home.
What are the ratings for Summer Wars?
Summer Wars scores 7.5 on The Movie Database, 7.4 on IMDb, 87% on Rotten Tomatoes, and 70 on Metacritic.
Who stars in Summer Wars?
Summer Wars stars Ryunosuke Kamiki, Hitomi Miyauchi, Mitsuki Tanimura, Sumiko Fuji, and Ayumu Saito. Mamoru Hosoda is the director.
How long is Summer Wars?
Summer Wars runs 1h 54m (114 minutes).
When did Summer Wars come out?
Summer Wars was released on August 1, 2009.
Which studio made Summer Wars?
Summer Wars was produced by Madhouse, Nippon Television Network Corporation, and KADOKAWA Shoten in Japan.
How much did Summer Wars make at the box office?
Summer Wars grossed $18,434,328 worldwide.
What language is Summer Wars in?
Summer Wars is in Japanese, and its original title is サマーウォーズ.
Ratings and streaming availability are aggregated from third-party sources; metadata from The Movie Database (TMDB), streaming data from JustWatch. This product uses the TMDB API but is not endorsed or certified by TMDB. Streaming availability checked September 2026.