Twenty years ago, there was a prophet who foretold the birth of a Calamity. As if to corroborate that prophet's prediction, over the past ten-odd years, perhaps as an omen of the Calamity's birth, the strength of monsters has dramatically increased, and Humans alone can no longer resist.

Therefore, the Emperor of the Empire that unifies Humanity issued an imperial decree to summon a Hero from another world. And so, through immense effort and magical power, the Hero summoning was finally successful.

___After that, the Hero Shohei and his party honed their strength while slaying monsters. And Shohei became overconfident.