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Summer Wars

Original title: Samâ wôzu

“Always protect your network.”

2009 · 1 h 54 min
Directed by Mamoru Hosoda · Japan · Animation and Puppet Film
ActionAdventureAnimationSci-Fi

Where to watch in the United States: Stream: HBO Max Amazon Channel, HBO Max · Rent: Amazon Video, Apple TV Store, Google Play Movies, YouTube, Fandango At Home · Buy: Amazon Video, Apple TV Store, Google Play Movies, YouTube, Fandango At Home. Streaming data from JustWatch via TMDB; availability changes.

Cast

Ryûnosuke Kamiki Nanami Sakuraba Mitsuki Tanimura Takahiro Yokokawa Mieko Nobusawa Mutsumi Sasaki

Credits

Written by: Mamoru Hosoda

Plot

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.

Sinekatalog’s take

Mamoru Hosoda's animated adventure is colourful, funny and big-hearted, mixing family comedy with cyber action.Sinekatalog’s own editorial review – not a user or critic quote.

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Ratings

IMDb: 7.4 / 10 (34,626 votes)
Rotten Tomatoes: 81%
Metacritic: 63/100
IMDb rating and vote count from the IMDb ratings dataset (October 2026). Scores change over time.

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