Crushed by despair, a man named Kael attempts suicide, but instead is reborn in the fantasy world of Eldoria. There, he discovers a unique power to manipulate concepts and forms a party of adventurers: a Barbarian, an Elf, a Mage, and a Saintess. After their rapid rise to fame for feats like slaying a Diamond-rank Fenrir, they rescue Princess Leora from an ambush. Witnessing their strength, Leora recruits them for a vital mission: to avert a devastating prophecy by hunting down and killing the world's four reigning Demon Lords, who are believed to be the heralds of a world-ending threat.