盾の勇者の成り上がり

Naofumi Iwatani, an otaku college student, is summoned to another world as the Shield Hero, one of four Cardinal Heroes armed with legendary weapons. While the Sword, Spear, and Bow Heroes gain allies and funding from the kingdom of Melromarc, Naofumi is framed for a crime by his sole companion, Princess Malty, and cast out with nothing. Stripped of trust and resources, he purchases a demi-human slave girl named Raphtalia and begins rebuilding from zero, fighting the interdimensional Waves of Calamity that threaten the world.