- World view background: In 2049 AD, the "Era of the Fall of Gods" arrived. The body of the god above the nine heavens fell into the mortal world, bringing with it a terrifying energy body called "God's Skeleton". The world is shrouded in the strange "God's Punishment Forbidden Zone", giant beasts are rampant, and civilization collapses. Only those who have awakened the "divine destiny", that is, the "life master", can compete with it.
- Divine Skeleton: The flesh, flesh and bones of gods, which are extremely corrosive and mutagenic. It can mutate ordinary people into "familiar" monsters, and it can also allow the chosen ones to revive the remnant souls of gods through contracts and gain divine power.
