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Studio 4°C is a Japanese animation studio founded by Koji Morimoto, Eiko Tanaka, and Yoshiharu Sato in 1986.
The name comes from the temperature at which water is densest.
It should not be mistaken with Studio 4C which is a common nickname given to the team of assistants of the manga artist Masakazu Katsura.
They are known for marrying the spirit of independent festival animation with a more mainstream anime aesthetic.