The Raregroove Kingdom (レアグローブ王国) is the prime antagonistic faction in the history of the world of the Rave Master (Series).
For over every eight thousand years, the Raregroove Kingdom were in continuing conflict with the Kingdom of Symphonia. Ultimately granting the Raregroove Kingdom's population the power of the gods, they used the Dark Bring to bring utter chaos and destruction as an ultimate weapon which will destroy every nation. But the Symphonia Kingdom used the Rave Stones to stop them from using it.
In grave consequence, the Dark Bring will unleash an Overdrive which will take the form of a gargantuan explosion that decimated over one-tenth of the entire world.