The Shield Hero Fanfic/Rewrite (Dandial)

A hero named Naofumi, from Earth, gets summoned to a realm called Dandial. Equipped with only a shield he is chosen to be one of The Four Cardinal Hero's to fight against a disaster called The Waves. When a cruel betrayal shatters his reputation, he turns his back on the fantasy world that rejected him first, fighting evil alongside courageous and loyal allies.