The continent of Seldeas is home to seven races—Dinosaurians, Merfolk, Dwarves, Elves, Zoans, Harpians, and Humans—each devoted to one of seven gods. Etched deeply into the long history of this continent is the name of one man.

"The Child of Destruction," Soma Kisaki.

He suddenly appeared in the western regions of ancient Seldeas, led the races then reviled as demi-humans in a rebellion, burned countless cities, and annihilated numerous kingdoms. He brought war, terror, and destruction across the entire continent, and ultimately became a man still feared as history's worst destroyer and mass murderer.

However, his true identity was Soma Kisaki, a perfectly ordinary boy summoned from modern Japan, who loved anime and manga.

This is a grand historical war fantasy about a commonplace Japanese boy—summoned to a parallel world devoid of levels, skills, or magic, and not only granted no cheat abilities but stripped even of the power to fight on his own—who sheds tears, vomits in disgust, and sometimes tastes defeat, yet still strains his intellect and fights alongside his comrades, ultimately etching his name into history.