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.

The seal of the legendary Demon Castle, Ladan, has been broken.

Ryuga and Rian are summoned by Lume and asked to search for the Red Dagger and Blue Dagger, which have been separated from the Dharma Sword.

At the same time, the Demonic Dharma Master Garde also began his activities to search for the Dagger.

With the help of D. Ringo and Yukihime, whom they meet again, Ryuga and Rian reach the Red Dagger, but then Horror Vicuro (Hidekazu Ichise) appears.