The Skeleton Hero's Hunt

Wasn't defeating the Demon King supposed to send me back to my old world, where I could get promoted, earn more, drive a Porsche, marry a beautiful rich woman, and reach the pinnacle of life? So why have I transmigrated back again, only to become a skeleton... And why has this world gotten so weird? The people are weird, and the gods are weird too... Power levels: Ranks 1–9, Saint Domain, Demigod. That's all you need to know. It won't be much help.