The setting where this group takes place is in Reaper"s sphere, a realm overlapping the human world, but the dominate creature ruling this world is not humans, but reapers. both worlds are connected. just like reapers and humans, they are both connected as well, when a reaper dies, his spirit is transported to the womb of a mother, as a child, and he becomes a human, but when a human dies, his spirit is transported to the other side as a reaper, and this cycle continues. saying this, but not all humans have the right to become a reaper, it is judged upon the acts of there deeds, when a villain dies from the human world, he is granted the right to repent, and if he fails his spirit will be consumed, destroyed, and shall never be reborn again. in the Reaper's sphere you will get a much closer look at how they live, you will be put into the shoes of a reaper.