岩谷尚文(石川界人 配音)是一个内心里充满了正义感的青年,对世界上发生的很多不公平的事情都深感愤怒。一次偶然中,他被传送到了异世界里,成为了能够使用各种各样不同功能的盾牌的盾之勇者。本以为可以就此展开伸张正义的旅途,哪知道刚刚过去几天,他就经历了战友的背叛,而且丢掉了所有的财物。尚文发誓再也不要信任这个世界里的任何人了。 就在这个节骨眼上,尚文的面前出现了一位名为拉芙塔利亚(濑户麻沙美 配音)的少女,拉芙塔利亚是一名奴隶,尚文决定用金钱来换取忠诚将她买下,在相处的过程中,拉芙塔利亚渐渐爱上了自己的主人。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 Malty 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.