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Naofumi Iwatani, an easygoing Japanese youth, was summoned into a parallel world along with three other young men from parallel universes to become the world's Legendary Heroes and fight inter-dimensional hordes of monsters called Waves. 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 other heroes received a sword, a spear, and a bow, weapons meant for attack