Son of the leader of the Fuga Clan that uses his body to bring back an powerfull demon.
Three hundred years ago the Fuga Clan and the Kannai´s fought a terrible war. The Kannagi´s won by little, only because they were able to seal a powerful yoma called Geho, that was their main source of power. Since then the Fuga Clan was allowed to work as servants for the Kannagi´s, but the reckless way they were treated during those three hundred years made them want to seek for revenge. The leader of the clan gave his own son, Ryuya, as a host of a small portion of Geho´s dark powers. With this new powers Ryuya started a series of murderers between the Kannagi family, using Kazuma to disguise himself. Finally he kidnaps Ren and, as Kazuma, Ayano and Jugo discovered, he intended to use him as an ultimate sacrifice to raise Geho from his prision, because only a direct descendant from the Kannagi family would be able to break the demons seal. He succeeded in this but Kazuma and Ayano managed to save Ren at time, anyway, the demon possessed Ryuya´s body appearing in its true form and regardless the Fuga´s Clan effort he killed them all in a single blow, because after all those years all what was left of him was pure rage against the Kannagi. With this savage intentions he started his way to the Kannagi´s house, but after a fierce battle, Kazuma and Ayano, were able to destroy him for ones at all.