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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.

Robber Hayashi (Kazuki Namioka) finds a wooden box with a mysterious mark while on the run with his companion Hirata. The old knife inside is a shadowy object, and Hayashi is possessed by the horror Bukeri. Sensing the appearance of Bukeri, Ryuga and Rian meet the director of a nursing home (Nagare Hagiwara) and a woman about to get married, Mina (Anri Sakaguchi), during their search.

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.

A man appears at D. Ringo's shop asking to buy a bag. The bag has the same mark on it as the wooden box that previously contained the Yinga object. Ryuga and Rian begin their search using the mark as a clue. Ryuga chases the driver (Aja Kong) carrying the crate, while Rian disguises herself and goes to the antique shop owner Danke (Lou Oshiba)...

D. Ringo succeeds in resonating between the Daggers, taking a hint from Gardo's words. Ryuga and Rian approach the Blue Dagger under the guidance of the Red Dagger. When the resonance stops, Jinga and Amiri appear in a black limousine. Jinga takes out the Blue Dagger and provokes Ryuga, telling him to defeat her and take it. Ryuga and Rian accept. However, Jinga had a secret plan.

Riang wanted to fight together with Gardo, as they are also magical lawbreakers. Taking the Dharma Sword with him, Gardo mocks Ryuga, Rian, Jinga and Amiri, and discovers a wolfsbane rising into the sky. It belonged to Gardo's home, the village of the Fire Clan. That night, Sumida (Michael Tomioka), a man who pretends to be a gourmet, enters the restaurant. He becomes a horror-lessard and preys on the cook.

Daigo, who teaches the children who are the future Demon Knight, is visited by his brother Seiji Hinoha (Hiroyuki Takashima). Daigo and Seiji are happy to see each other again. Meanwhile, the training ground is attacked and the children are eaten by a horror. Ryuga and Rian chase the horror and arrive at Daigo's training ground. A mysterious man, Woska (Funaki Masakatsu), also shows up at the training ground.

Ryume continues his research into Radan and the Dharma Sword, as well as Jinga and Amiri, and discusses them together with Riang. At the same time, Ryuga, who is going around destroying objects in Yinga, is suddenly attacked by the horror Zelaza (Mi Yi mie). Ryuga struggles against Zelaza, who runs away through electric wires. Meanwhile, Gardo, who is searching for the whereabouts of Radan, happens to see Jinga and starts tracking him down.

Garudo falls into a trap and is captured by Jinga and Amiri, who put him under severe interrogation. Led by Haruna, a doll dropped by Gardo, Ryuga and Rian head for the Forest of Spirits. Haruna tells them about Gardo's spectacular past. At the same time, businessman Hedera (Yabe Kyosuke), walking near the Forest of Spirits, promises to retrieve the Dharma Sword to a blue butterfly, a servant of the flying Amiri.

The voice of the doll Haruna was the voice of Gardo's sister Haruna herself. She entrusts Ryuga and Rian with the Dharma Sword, and they rush to rescue Gardo. When Gardo refuses to yield to the horror Geril (Ken Maeda), Jinga and Amiri tell him that they have taken Haruna as a hostage. Gardo decides to prioritise being the protector over Haruna's life, and puts his life on the line to defeat Jinga and the others...

Garde asks Haruna to perform a secret technique to locate Radan. Gardo thinks that the huge evil spirit detected by Rume is Radan, and heads for the swamp with Ryuga and Rian. Meanwhile, Tatsumi (Katsuhiro Higo) is night fishing in the swamp when a bewitching beauty (Mero Imai) suddenly appears and invites him to join her. Haruna prepares to perform a secret technique, but for some reason D. Ringo stops her...

Thanks to the efforts of D. Ringo and Haruna, the location of Radan is finally discovered. Yukihime and Rian care for Haruna, who is fatigued from performing the secret technique. With Haruna recovering, they discuss their feelings about Ryuga, Gardo, Daigo and Radan. However, a suspicious man, Ginge (Nagira Kenichi), spies on the three of them from outside the restaurant...

The location of Ladan is discovered, but the obstacle is Jinga and Amiri, who are waiting for them there. Thinking that it will not be easy to reach it, Ryuga and the others divide their roles and start investigating. Rian infiltrates inside, Gardo investigates the surroundings, and Ryuga visits Lume. Ryuga believes that he has no chance of winning if he does not break Jinga's dark wards...

Backed by D. Ringo, Yukihime and Haruna, Ryuga, Rian, Gardo and Daigo run towards Radan, which sits on the top floor of a high-rise building. However, Jinga and Amiri, who should have been cornered, smile wryly for some reason. Ryuga and the others reach the room where Radan is located, but the room suddenly transforms into a different space. Eerie moans echo through the room...

Riangli is captured by Jinga, who flies away. Amiri, who stayed behind to help Jinga escape, is conversely captured by Ryuga and his group. Telling Ryuga and the others to wait for instructions, Rüme goes after the jinga by herself. Amiri suddenly begins to suffer and faints. When Amiri regains consciousness, she calmly tells them that she is a Demon Lawyer...

Ryuga falls into Amiri's trap, and is sucked into the magical mirror, where he continues to fight the demonic beasts that lurk in the jet-black magical mirror space. However, Ryuga is exhausted both mentally and physically, and falls into an abyss. Meanwhile, Ryume rushes to Rian's side, but struggles against the onslaught of Jinga. The countdown to the awakening of Radan goes on mercilessly before the eyes of Gardo and Daigo, who have reached the end of the line.

The jinga was defeated by Garo Sho = Garo Darkness, who gained the power of darkness. However, he was unable to seal Radan. Ryuga and Lume devise a plan to save Rian, who has been knocked unconscious by Jinga's attack. Meanwhile, Daigo's proclamation is sent to Gardo, who feels responsible for everything and has lost confidence.

Rian suppresses the jinga lurking in her mind with the help of Ryuga. However, the jinga has not yet disappeared from Rhyme's mind. Rhyme proposes a ritual to purify the jinga from Rian, who is still unable to wake up. However, Garde opposes this.

During the ritual at the Fountain of Sunshine, Amiri's trickery has brought Jinga back to life. Daigo, determined to keep Radan from awakening, challenges Jinga to a battle by himself. The power of the beast knight Giga gradually drives Jinga to the brink...

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.

Radan Castle, which sucks out all life just by walking. Ryuga rides into the throne and engages in a fight to the death with Jinga. Who will be the winner of the battle between light and darkness? Light up the darkness with the light of hope, Golden Knight Garo Sho! Blow the golden storm!