Iwatani Naofumi and three other persons were summoned to a parallel realm to become the world's Heroes. When Naofumi was summoned, he was given the Legendary Shield as his weapon. Naofumi is branded as the weakest due to his lack of charisma and experience, only to be betrayed, unjustly accused, and robbed on the third day of the expedition. Naofumi's thoughts were filled with revenge and hatred after being shunned by everyone from the king to peasants. As a result, his journey through a parallel universe begins...