Some time after the battle in Line City.

Doga Ryuga and Rian, who continue to fight as protectors, encounter a new horror in one of the cities.

Meanwhile, the Demon Warrior Gen (Shimojo Atom) has gone to the shrine where the legendary Demon Castle, Radan, is sealed.

With a determined look on his face, Gen draws his Dharma Sword.

Gazing at him are the mysterious young man, Jinga, and the mysterious beautiful woman, Amiri.

Ryuga and Rian feel the presence of horror in an abandoned building. But there was more than one horror.

A large number of horrors inhabit the entire building.

In Ryuga and Rian's crisis, the magical knight Daigo Akizuki appears.

Rian tries to annihilate the horrors with a secret technique.

She sees Yoshito (Konno Hiroki), who remains in the building.

For some reason, Daigo stops Rika from running out to rescue him.

Yuki (Aki Umezawa), the woman they saved from the horror Hertzbai a few days ago, has asked Ryuga and Rian to help her find her missing sister Lisa (Emi Kobayashi).

Lisa may have been attacked by a horror in the circumstances.

Ryuka heeds Yuki's wish and follows Lisa's rumours to the bar's owner, Kaji (Hitoshi Katagiri).

Meanwhile, Lisa is locked up in a mysterious room.

Leaving the injured Daigo behind, Ryuga, Rian, Lume and Gardo head for Ladan. Sitting on a throne, Jinga finally brings the legendary Radan Castle back to life in the present day. The Radan Castle contains a terrifying ability that will drive mankind to despair.