The game is set nowadays, the boneless (rebel reapers) have dominated the world taking the place of humans and now Eternus (World of true reapers) is on the brink of collapse with the lack of human souls fueling the core. Deff is the only elite Death that has not corrupted itself on the boneless side but has also never had an interest in helping the grim reapers because him lives as a mercenary. After Deff took a critical attack that left him paraplegic, his desire for revenge motivated him to meet the challenge of facing the boneless to save Eternus.

The game is set nowadays, the boneless (rebel reapers) have dominated the world taking the place of humans and now Eternus (World of true reapers) is on the brink of collapse with the lack of human souls fueling the core. Deff is the only elite Death that has not corrupted itself on the boneless side but has also never had an interest in helping the grim reapers because him lives as a mercenary. After Deff took a critical attack that left him paraplegic, his desire for revenge motivated him to meet the challenge of facing the boneless to save Eternus.