So What's Wrong with Getting Reborn as a Goblin?, Vol. 1 — Nazuna Miki

Nice guys finish last -- no one knows that better than office worker Akira Yagami, who loses his life after jumping into oncoming traffic to save a child. But death is not the end for our selfless hero, as he is reincarnated in another world -- not as a human, but as a goblin! Normally, goblins only live for seven days, but thanks to Akira's unique skill, he's got eighty years to leave his mark on the world! Eager to make the most of his time, he starts stocking up on skills left and right, and one fateful day, he comes upon the Archfiend himself, who offers him the power to make anyone he defeats eternally loyal to him! With the world in the palm of his hand, how will he choose to use his newfound powers…?