The Reprise of the Spear Hero

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and 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, 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!

(Source: One Peace Books)

Don’t like the outcome? Then start over and do it again! An exhilarating, new otherworldly redemption fantasy begins in this spin-off of the massively popular otherworldly fantasy, the Rising of the Shield Hero! Motoyasu Kitamura is summoned to another world to serve as the Spear Hero, but something eventually manages to kill him. When he dies Motoyasu suddenly finds himself back on the day he was first summoned to the new world—without losing any of his power! It’s the start of a new game in god mode! This time he’s determined to get things right—for the sake of his beloved Filo-tan, the magnificent filolials, and his “father,” the Shield Hero. 
(Source: One Peace Books)