Tate no Yuusha no Nariagari

About Tate no Yuusha no Nariagari Manga:

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga in Tate no Yuusha no Nariagari Manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction.

As the Shield Hero Manga, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!