On the continent of Seldias, where seven races -- Dinosaurs, Mermen, Dwarves, Elves, Zoans, Harpies, and Humans -- live, the name of a single man is deeply etched into the long history of the continent. 'Soma Kisaki, the Destroyer's Heir.' He suddenly appeared in the western region of ancient Seldias, leading a race that was then called sub-humans and despised, and rebelled against the established order. He burned many cities and destroyed several kingdoms, bringing war, terror, and destruction to the entire continent, and is still feared today as the worst destroyer and mass murderer in history. However, his true identity was a very ordinary Japanese boy named Soma Kisaki, who loved anime and manga and was summoned from modern Japan. In a world without levels, skills, or magic, and without any cheat abilities, this ordinary Japanese boy, who was even deprived of the ability to fight, shed tears, vomited, and experienced setbacks, but still managed to use his wits and fight alongside his companions, leaving his name in history. A grand war fantasy.