All of a Sudden is a 2026 drama film directed by Ryusuke Hamaguchi, in his French-language debut. Co-written by Hamaguchi and Léa Le Dimna, it is loosely based on the non-fiction book You and I – The Illness Suddenly Get Worse by Makiko Miyano and Maho Isono. It stars Virginie Efira and Tao Okamoto. The film is a co-production between France, Japan, Germany and Belgium.