An ancient and strange golden library with countless books.
Zero was rescued from the edge of death and came to this library. He thought it was a new beginning, but he didn't expect it to be a new life.
Zero: "There are many books here."
Old man: "Boy, every book here represents a world."
Zero: "So, we want to protect world peace?"
Old man: "No, we want the world to function normally."
Finally the old man's time came, and Zero took the librarian's token.
The first world Zero goes to is a world with evil spirits...
