

Midsummer's Equation
Masaharu Fukuyama reprises his role from 2008's "Suspect X," playing the physicist-cum-detective Manabu Yukawa. The scientist-sleuth arrives in an oceanside town to speak on a panel. But when a man turns up dead outside the inn where he's staying, Yukawa begins to unravel the connections that tie the victim to the activist daughter of the innkeepers, and a precocious boy who first appears on a train—and keeps popping up. It's a Sherlock Holmes mystery with an environmental twist, and one that should please fans of a classic whodunnit.
Where to watch Midsummer's Equation in United States
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Click a service to open Midsummer's Equation there. Availability last verified on June 21, 2026.
About Midsummer's Equation
Midsummer's Equation is a 2013 Japanese-language crime, drama and mystery film directed by Hiroshi Nishitani. The cast is led by Masaharu Fukuyama, Yuriko Yoshitaka, Kazuki Kitamura. It has a runtime of 2h 9m.
Midsummer's Equation was produced by TOHO, FILM, and AMUSE and made in Japan. It was released on June 28, 2013.
- Director
- Hiroshi Nishitani
- Writers
- Yasushi Fukuda
- Release date
- June 28, 2013
- Original language
- Japanese
- Status
- Released
- Country
- Japan
- Production
- TOHO, FILM, AMUSE
Midsummer's Equation cast & crew
Midsummer's Equation was directed by Hiroshi Nishitani and written by Yasushi Fukuda.
The cast features Masaharu Fukuyama as Manabu Yukawa, Yuriko Yoshitaka as Misa Kishitani, Kazuki Kitamura as Shumpei Kusanagi, Anne Watanabe as Narumi Kawabata, Jun Fubuki as Setsuko Kawabata, and Hakuryu as Hidetoshi Senba.
Behind the camera, the score was composed by Masaharu Fukuyama, cinematography is by Katsumi Yanagijima, and it was produced by Yoshihiro Suzuki and Chihiro Kameyama.
Is Midsummer's Equation worth watching?
At 2h 9m, it's a standard feature-length watch.
If you enjoy crime, drama, and mystery, Midsummer's Equation is worth a place on your watchlist.
How and where to watch Midsummer's Equation
Midsummer's Equation isn't currently available on major streaming services in United States. We track availability continuously — add it to your watchlist and we'll keep an eye out.
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.
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Cast of Midsummer's Equation

Masaharu Fukuyama
Manabu Yukawa

Yuriko Yoshitaka
Misa Kishitani

Kazuki Kitamura
Shumpei Kusanagi

Anne Watanabe
Narumi Kawabata

Jun Fubuki
Setsuko Kawabata

Hakuryu
Hidetoshi Senba

Gin Maeda
Shigeharu Kawabata

Naomi Nishida
Nobuko Miyake

Sansei Shiomi
Shoji Tsukahara

Tetsushi Tanaka
Keiichi Tsukazaki

Hikaru Yamazaki
Kyohei Tsukazaki

Tôru Kizu
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Midsummer's Equation — FAQs
▸Where can I watch Midsummer's Equation in United States?
Midsummer's Equation is not currently available on major streaming services in United States. Availability changes often — check back soon.
▸What language is Midsummer's Equation in?
Midsummer's Equation is originally in Japanese. Subtitle and dub options vary by streaming service.
▸How long is Midsummer's Equation?
Midsummer's Equation runs 2 hours 9 minutes (129 minutes).















