Rave Master 8

Haru's journey has led him to Gen Tower, home of the Demonoid horde. To stop the demonoid attacks, and find out the truth about Gale, Haru and his friends must brave this monolith of evil and battle the Five Palace Guardians. But, at the end of their journey waits King, the Demon Card leader, whose "Apocalypse" Dark Bring is capable of bringing about another Overdrive.