Ghost Beads

[City+Alien World+Superpower+Ghost+No Harem+Genius] There was a corpse inside a small glass bead. When the boy picked up the bead and looked at it, the corpse inside the bead suddenly opened its eyes. Everything starts from this night... "The dead man breathes again, and his heart beats again, but when he wakes up, he is no longer the same person as before. A new life is born. We call it a 'ghost'!" "When people die, they turn into ghosts, and when ghosts die, they turn into beads. If you eat the ghost beads, you can gain their abilities. This is the ghost contracter!"