A gamer is magically summoned into a parallel universe, where he is chosen as one of four heroes destined to save the world from its prophesied doom.

Stories of old tell of four otherworldly heroes - wielding the sword, spear, bow, and shield - who defended the land from wave after wave of calamity. With the fate of the world in balance, the kingdom of Melromarc summons these legendary figures; in modern-day Japan, the call is answered, and the unwitting heroes are transported to this fantasy universe. Thrust into Melromarc and given the title of "Shield Hero," otaku Naofumi Iwatani is labeled the weakest due to his lack of offensive capability and apparent inexperience. When the heroes part ways to start their journeys, he only has one willing companion: the beautiful princess Myne Melromarc. However, she soon betrays him, steals all his money, and accuses him of taking advantage of her. For his alleged crimes, Naofumi is branded a criminal and made outcast of society. With hatred filling his heart, he sets out alone, vowing vengeance against those who wronged him.

Raphtalia corners Idol with vengeance in her eyes, her bloodthirsty blade reaching for his throat. Naofumi's words bring her back to her senses momentarily, but when Idol attacks her once again - Then Raphtalia confronts her past once again.

Ordinary Naofumi Iwatani are summoned to a magical kingdom he must protect from invading monster hordes, but are instead betrayed and accused of rape. Alone, hated and with a magical shield that forbids him to use any kind of weapons, he has no choice but to buy a slave in order to survive monsters and a hostile kingdom.—André