日本沉没 2020 剧场版》将于 11 月 13 日（周五）在全国上映，该片基于原播出版本的 10 集，由汤浅导演进行了剪辑和重构，并配有 5.1 声道剧院音效。

该片从已发行的 10 集内容中，将充满现代社会各种元素的信息量缩小到一部影片中，使 2025 年日本沉没的主题和永恒性更加清晰。 日本正在沉没，人们将何去何从，我们又该如何看待这一现状？生命的接力棒之外又蕴藏着怎样的希望？

面对无从选择的终极抉择，人们所面临的现实与重生的故事又开始了！

The Mutou family leads a peaceful life: Kouichirou works at a construction site and his wife Mari is returning from an overseas trip. Their daughter Ayumu has just finished her track practice while their son Gou is playing video games at home. However, life as they know it is flipped upside down when a calamitous earthquake strikes the entire Japanese archipelago—obliterating the face of the country in an instant. With society crumbling around them and their nation gradually sinking into the ocean, the Mutou family must band together to survive the catastrophe. Treading the near-apocalyptic setting, they struggle not only to stay alive, but also to learn the difficulty of coping with loss.

En el año 2020, justo después de los Juegos Olímpicos de Tokio, los cuatro miembros de la familia Mutou se ven atrapados en un terremoto que golpea Tokio e intentan escapar de la ciudad, mientras el desastre les pisa los talones.