I, The Sacrifice, Somehow Killed The Evil God

Elt sacrificed himself to the evil god in place of his childhood friend. He was prepared to die in the face of the evil god's attack, and was supposed to meet his end.... However, at that moment, his unique skill "Inventory" activates, and he finds himself turning the tables on the evil god. Surviving, Elt sets off for his home village to inform his childhood friend of his safety, but on the way, he encounters a powerful monster walking through the forest—however, as he prepares to avoid the confrontation, he spots a fainted girl right next to the creature! Source: MU