Heaven's unlikely bounty hunter is back! A devil on a "mission from God," Mercy Sparx has spent years ripping halos off of whichever rogue angel Heaven orders her to, but now it appears there's a much bigger problem - her mother! The malevolent Faustia has found a way onto Earth, and has gotten the upper hand on both Heaven and Hell. To defeat, her, Mercy's only chance is to dive deep into her memory, and relive a painful childhood in the underworld of Sheol.