The Symphonia Kingdom (シンフォニア, Shinnfonia Oukoku) is the rival kingdom of the Raregroove Kingdom that existed for over thousands of millennia.
For over every eight thousand years, the Raregroove Kingdom are at war with the Symphonia Kingdom. Ultimately granting the Raregroove Kingdom's people 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. Bit has a grave consequence, the Dark Bring will unleash an Overdrive which will take the form of a gargantuan explosion which will decimate over one-tenth of the entire world. Resha Valentine had been born prior to the events of Rave Master.