Midsummer's Equation (真夏の方程式, Manatsu no Hōteishiki) is a 2013 Japanese police procedural film directed by Hiroshi Nishitani.

[1] The film grossed ¥3.31 billion (US$33.92 million) in Japan in 2013, becoming the year's 8th highest-grossing film in Japan,[2] and the highest-grossing live-action Japanese film of the year in the country.

[3] Two days after opening in Hong Kong, it had earned HK$1.48 million (US$192,000),[4] and it went on to gross US$701,465 in Hong Kong.

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