College student Iwatani Naofumi is reading a book titled "The Records of the Four Cardinal Weapons" in the library when he is suddenly summoned to another world and told he has to save the world as the Shield Hero, one of the Four Cardinal Heroes. And one morning, he finds all his money and equipment gone.
To save the world from the Waves, four heroes 
will be summoned from another world."
لإنقاذِ العالم منها، سوف يُستدعى أربعة
"أبطال من عالمٍ آخر
"Per salvare il mondo da esse,
quattro eroi saranno evocati da un altro mondo."
Para salvar o mundo disso, quatro heróis
de outro mundo devem ser invocados."
И чтобы сберечь мир,
из иного мира призывают четвёрку Героев?