F-Rank Skeleton? My Contract with the School Beauty Lifts Me to Emperor!

Death as a delivery driver wasn't supposed to lead to this—reborn as the weakest F-rank Skeleton Soldier in another world, contracted to a tearful campus belle who everyone mocks for her terrible choice. But jokes on them: I've awakened an infinite devouring evolution system. While they laugh, I'm silently tearing apart monsters and climbing the ranks. From pile of bones to apex predator, I'll devour gods and build my throne from their remains. When the world cracks and doomsday flames lick at my feet, they'll all kneel before the Bone Emperor.