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"In this world, there exist beings known as the Four Calamities." "The Four Calamities are essential, benevolent entities that have maintained the world since ancient times, yet they are also perceived as evil beings that instill instinctive terror in every living creature." "Any act of interference with the Four Calamities is treated as a taboo, strictly regulated and severely punished." "Legends and eyewitness accounts describe the locations of the Four Calamities as follows:" "One resides within the magma chamber of the world's largest volcano." "One resides in the depths of the indigo seas, where no light can reach." "One resides somewhere deep beneath the earth." "One resides somewhere beyond the furthest reaches of the sky." "Those permitted by the state to investigate or observe these Calamities—acts which are otherwise restricted—are extremely few." "For the Adventurers' Guild, being an S-Rank adventurer is the minimum requirement. Any request taken is at one's own risk, and the Guild provides no support whatsoever." "For the Magic Tower (the collective term for magic-related institutions), one must be at least Sage-class or a First-Class Mage, and must act entirely at their own risk." "Thus, only a handful of individuals within each organization are permitted to accept requests involving the Four Calamities."