All humans, are afraid of monsters, the monsters they keep inside of them. They drove the species who are able to expose the monsters in them down the purgatory underground. There, in the purgatory deep inside the earth where people are made, he was born. He hated, and loved, the monster that is forming inside of him more than anyone else. Together with his second mother, he climbed up to the world where the people who have driven him into the underground live. However, at that time, it was too late. This world above ground is waiting for its slow death, same as the people who are continue to stay there. This world, this surface, is the realm of the dead. And this species called humans, they have built for themselves a world of twilight. There, he met a ghost called "father". His second mother, who has come to this netherworld with him, remained there, while he returned to the purgatory where he was born. That place, the place where he lives, that purgatory. That should be the last world of humans.