Summer Wars poster
Where to stream

Summer Wars

7.520091h 54mPGMovieAnimationScience Fiction

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…

DirectorMamoru Hosoda
WriterSatoko Okudera
ProducersNozomu Takahashi·Takuya Ito

Where to watch

HBO Max Amazon ChannelHBO Max Amazon ChannelHBO MaxHBO Max
Availability shown for United States · rights vary by country

Cast · Directed by Mamoru Hosoda

RKRyunosuke Kamiki
Ryunosuke Kamiki
Kenji Koiso (voice)
HMHitomi Miyauchi
Hitomi Miyauchi
Natsuki Shinohara (voice)
MTMitsuki Tanimura
Mitsuki Tanimura
Kazuma Ikezawa (voice)
SFSumiko Fuji
Sumiko Fuji
Sakae Jinnouchi (voice)
ASAyumu Saito
Ayumu Saito
Wabisuke Jinnouchi (voice)
TYTakahiro Yokokawa
Takahiro Yokokawa
Takashi Sakuma (voice)
KTKiyomi Tanigawa
Kiyomi Tanigawa
Yukiko Shinohara (voice)
MSMutsumi Sasaki
Mutsumi Sasaki
Kazuo Shinohara (voice)
MNMieko Nobusawa
Mieko Nobusawa
Mariko Jinnouchi (voice)
TKTakuya Kirimoto
Takuya Kirimoto
Riichi Jinnouchi (voice)
STSakiko Tamagawa
Sakiko Tamagawa
Rika Jinnouchi (voice)
INIchiro Nagai
Ichiro Nagai
Mansuke Jinnouchi (voice)

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Summer Wars — streaming FAQ

Which OTT platform streams Summer Wars?

Summer Wars is streaming on HBO Max in United States, and available to rent or buy on Amazon Video and Apple TV Store. It's not currently on Netflix.

Is Summer Wars on Netflix?

No, Summer Wars is not on Netflix in United States as of October 2026. It's currently on HBO Max.

Is Summer Wars on Amazon Prime Video?

Summer Wars isn't included with a Prime Video subscription in United States, but you can rent or buy it on Amazon Video.

Where can I watch Summer Wars for free?

Summer Wars is available on HBO Max in United States, but you'll need an active subscription — there's no free option right now.