Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction. As the Shield Hero, the weakest of the heroes, all is t as it seems. Naofumi soon finds himself alone, penniless, and betrayed. With one to turn to, and where to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!