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The Great Disaster (大災害, Daisaigai) refers to an event that happened hundreds of years ago in the world of Fire Force, where flames exploded around the world, devastating it and leaving most parts of the planet uninhabitable. Continents were torn apart and some nations were utterly obliterated. As a result, survivors fled to the Tokyo Empire, which remained mostly stable during this time. The Holy Sol Temple and Haijima Industries created the Amaterasu generator, ensuring power could sustain the Empire. This power let the Empire develop further and allowed for more migration from the outside world. This lead to cultural changes within the Empire, such as it becoming customary to refer to others by the first names as opposed to their family names.