Iwatani Naofumi was summoned into a parallel world along with 3 other people to become the world's Heroes. Each of the heroes were respectively equipped with their own legendary equipment when summoned. Naofumi happened to receive the Legendary Shield, the sole defensive equipment, while the others received weapons capable of attacking.

Due to Naofumi's lack of charisma and experience, he ended up with only a single teammate, a beautiful woman, while others had several. Unfortunately, on his third day Naofumi was betrayed, falsely accused, and robbed by the said teammate.

Shunned by everyone from king to peasants, Naofumi's thoughts were filled with nothing but vengeance and hatred. Thus, his destiny in a parallel world begins ...