So What's Wrong with Getting Reborn as a Goblin? manga volume 1 features story by Nazuna Miki and art by Tsukasa Araki.

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!