File 00: Symphonia's Short History

Symphonia is a hidden world to Earthlings and Symphonians doesn't even know another world calls Earth exists. They are parallel dimensions but they are somewhat very much alike to each other. Symphonia's uses of electricity and technology is much like Earth's but theirs is much more high-tech. They both have humans and animals inhabiting the land. Despite all of this, there was one thing that was much different from the two: magic. Symphonia has a source of energy, called Jeno, that helps the land "live". Without it, Symphonia would falls into the depths of space and fade away along with its inhabitants.
Strangely enough... there were humans on the land who have Jeno borned inside them, thus, had a certain power of their own that they had to somehow "unlock". These humans were named Jeons. Although, the Jeno has a potential to disappear someday if it's user doesn't feel strongly about something.
Because the existences of these humans, a "tool" calls J-Pin was created. Each and every single J-Pin has a different power and different type of Jeno that can only be activated by certain Jeons with the same sort of types that match the pin. These J-Pins can only be activated by those who have Jeno inside them and can longer be activated if the Jeno leaves that person.
Somewhat related, there is an existence of another creature other than humans and animals: Runes. These are monsters that were created by a dark type of Jeno released from an unknown source that feeds down on the Jeno that is needed for Symphonia to survive. Runes only attack Jeons and leaving humans untouch, but they will leave no one alive if they get in the way, because their goals is to feedon Jeno to survive. This is a problem that Symphonia struggles for hundred of years.
Some of the good-willed Jeons out there helped out by "dispatching" these Runes, sending back to the Lost Era, where they originally came from and locked them there forever. But for some unknown reasons that the researchers had not yet reveal, the Runes kept coming and many Jeons end up dying because they could not protect themselves. Jeons are now a rare inhabitant of Symphonia and there only less than 50 left. Sooner or later, Symphonians afraid that once Jeons are extinct, the Runes will feed on the land's Jeno instead, leaving nothing left.