However, she fails and soon discovers that Akari possesses the Pure Concept of Time, making her capable of reversing her death even after she has been killed. Top-class Executioner Menou has been tasked with eliminating Akari Tokitō, a Lost One who has been summoned by King Grisarika of the Noblesse, the noble class. Among the Faust are Executioners, members that wield magic – etheric powers – and set out to secretly assassinate any Lost Ones that may still appear. To prevent such calamities again, the summoning of Lost Ones has become strictly forbidden and heavily managed by the Faust, a class of Church members in society. Even today, there exists four legendary disasters, dubbed 'Human Errors', which effects continuously rage on: the Sword of Salt, which turned the whole Western continent into salt that is gradually melting into the sea the Pandæmonium, a fog-like dead zone in the Southern archipelago from which monsters regularly emerge the Mechanical Society, which controls the wild frontier in the East and the Starhusk, which carved out the centre of the Northern continent and set it afloat. However, it was discovered that with prolonged usage, the Lost Ones would lose control of their Pure Concepts, bringing disaster and calamity to the world. In this new world they created an advanced civilisation with heavy Japanese influences and for a time, this world prospered. Long ago, wanderers called 'Lost Ones' came from an alternate world known as 'Japan', and each were given power beyond imagination titled 'Pure Concepts'.

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