A very ordinary geek college student Naoto Fumi Iwatani is led by a book he met in the library and is summoned to a different world. A given mission is to shake off the disaster “wave” that brings chaos to the world as one of the four saints brave who wears a sword, a spear, a bow, a shield “the brave of the shield”. Sentence who swelled his heart into a big adventure and set out with his colleagues. However, I will be betrayed a few days after my departure, I will lose all my money and position. Fang sentence who can not believe others tries to serve slaves girl _ raftalia, to wave, to the world. Will it be possible to break through this hopeless situation? A fantasy of the man who lost everything, the opening ceremony.