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

Office worker Akira Yagami's altruistic nature usually gets him the
short end of the
stick. When he dies after saving a kid from oncoming
traffic...he reincarnates in
another world as a goblin?! Normally, goblins
only live for seven days, but Akira's
newfound powers let him defy the
species' normal life span...and are the key to his
path to becoming the
strongest goblin ever!