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Summer Wars
Summer Wars

Summer Wars (2009)

75% User Rating
1h 54min
Animation
Science Fiction

"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.

Mamoru HosodaDirector

Cast

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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)

Takashi Kobayashi

Takashi Kobayashi

Tasuke Jinnouchi (voice)

Yutaka Shimizu

Yutaka Shimizu

Shota Jinnouchi (voice)

Kaori Yamagata

Kaori Yamagata

Naomi Miwa (voice)

Tagame Tamura

Tagame Tamura

Kiyomi Ikezawa (voice)

Tadashi Nakamura

Tadashi Nakamura

Mansaku Jinnouchi (voice)

Yoji Tanaka

Yoji Tanaka

Yorihiko Jinnouchi (voice)

The Movie Database

Hashiya Nakamura

Kunihiko Jinnouchi (voice)

Mitsutaka Itakura

Mitsutaka Itakura

Katsuhiko Jinnouchi (voice)

Eiko Kanazawa

Eiko Kanazawa

Noriko Jinnouchi (voice)

Chigusa Takaku

Chigusa Takaku

Nana Jinnouchi (voice)

Riisa Naka

Riisa Naka

Yumi Jinnouchi (voice)

Naoto Adachi

Naoto Adachi

Ryohei Jinnouchi (voice)

The Movie Database

Rikito Ota

Yuhei Jinnouchi (voice)

Yuki Imai

Yuki Imai

Shingo Jinnouchi (voice)

Sumire Morohoshi

Sumire Morohoshi

Mao Jinnouchi (voice)

The Movie Database

Hinano Minagawa

Kana Jinnouchi (voice)

Reviews (1)

All Reviews
CinemaSerf
CinemaSerf
Rating 70%

August 6, 2025

It’s really quite apposite to watch this film at a time when governments across the world are merrily acquiescing to the demands of global tech to facilitate the rampant advance of AI. This story quite cleverly illustrates just how easily a collection of “Will Hunting” types can be used to crack even the most complex (2,000 digit) numeric code and allow nefarious access to a global network which manages just about everything we do - from using our phones to firing a nuclear missile. It’s bright spark - but maybe just a touch inept - “Kenji” who has accepted a task that is definitely not what he was expecting from “Natsuki” and so finds himself at her grandmother’s ninetieth birthday luncheon posing as her beau. A bit of a nervous wreck, he is later presented with an online puzzle by “OZ”, the network in question and he manages to message back a solution. Next thing we all know, it’s been hacked by an increasingly violent AI that is bent on a quest for knowledge and power, and that will stop at nothing. When poor old “Kenji” is identified and gets the blame, only an unique sort of intervention from granny and a solid series of team efforts from her family and from his friends might enable them to thwart this menacing creation. The animation starts off with images that reminded me of one of those childhood kaleidoscopes that brought vibrant crystalline shapes together, before heading full pelt into a frequently quite pithily comedic look at family traditions, teenage hormones and menacing nasties threatening the entire fabric of the internet. You’ll possibly never see a more potent cinematic demonstration of just how dependent and inter-dependant we are on this network of cables and zeroes and ones for much, if not most, of modern life. Not just our social lives, but our actual lives too are controlled and once control of that falls into malevolent hands, well humanity risks being well and truly stuffed. The last half hour focuses a little more on dealing with that problem, and the quickly paced action animation is underpinned by a plausible degree of science too. In many ways, it’s almost a horror movie - especially if you think on it: first love or online demons?

Media

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Official Trailer [Subtitled]

Official Trailer [Subtitled]

Official English Trailer

Official English Trailer

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