"...'Naofumi Iwatani was summoned into a parallel world along with three other young men from parallel universes to become the world's 'Cardinal Heroes' to fight inter-dimensional hordes of monsters called 'Waves'. Each of the heroes are equipped with their own weapons. Naofumi happened received the 'Legendary Shield', his sole defensive equipment, while the other heroes received a sword, a spear and a bow.
"Unlike the other heroes who are fully supported by the kingdom and gain several strong allies each, Naofumi's luck turns to the worse after his single companion, revealed to be the kingdom's princess, betrays him, steals all his belongings and leaves him devoid of all assistance.
"Mocked by the nobility and shunned by everyone from his fellow Heroes to peasants, a now cynical Naofumi is forced to train as a hero alone while working to make ends meet, until he takes a young 'tanuki' demi-human girl named 'Raphtalia' and an egg that hatches into the bird-like monster 'Filo'.
"Both quickly grow into adulthood and become powerful warriors under his care. As they gain the trust and gratitude of the people with their actions, Naofumi and his companions work together to carry out their mission as saviors, as they unravel the mystery of the Waves and the reason why they are a threat not only to their world, but to other worlds as well..."
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