An incident occurred in Akebono City where various things were gnawed. People begin to fear at the sight of ancient demon creatures flying in the sky. But, Kenji had a more frightening cause of worry. It is said that his older sister who is scarier than the demon coming for a visit. If he doesn't show his older sister how well he is doing in town, he'll be taken back to the countryside. Kenji, who doesn't reveal that he is RyuKenDo, falls into a pinch. With flying demons appearing here and there, his older sister finally came to town!
At night, a policeman is seen patrolling Akebono City. He encounters a creature that is biting off the tops of things, including post boxes and signs. The creature started to attacks him, ruining his hat as he flees. His minus energy is released which is then gets inside the Revival Orb of Daimaou GrenGhost. As more things are being bitten off, there is a request for everyone in Akebono City to watch their heads. Kenji and Rin are seen eating ramen in a shop. Rin is asking Kenji why he is not eating. He replied that his older sister who is scarier than a demon is coming to this town. She wants to see him fighting demons. Upon hearing Kenji, Rin gets choked on her ramen. Rin is curious about how Kenji's older sister knew about this. He revealed that he wrote her a letter. If he didn't let her see him fighting demons, he will have to commit seppuku. Their conversation was overheard by Gajiro.
Gajiro started to share with everyone he knew about Kenji's scary older sister. The shop owner of Croquet meets Kaori and shared with her the news. Kaori thought of a plan and shared with them. Back in S.H.O.T.'s Base, Setoyama's research shows the monster is Anomalocaris, a previously extinct creature that existed millions of years ago during the Cambrian period and was one of the tops of the meat-eating life forms has been revived by Jamanga as a demon. Civilians in Akebono City started wearing helmets or hard objects to cover their heads. Kenji asked Amachi if he can reveal his identity as RyuKenDo to his older sister but gets rejected. Later, Kenji and Rin are seen walking on the streets. They stopped at the ramen shop as they are called by Kaori to enter the shop. He is shocked at everyone's disguise in demon attire. The shop owner wife explains that they heard Kenji is going to commit seppuku if he doesn't defeat a demon, therefore they mobilized everyone in the shopping district of Akebono City to take a role of a demon.
On a bridge heading towards Akebono City, a bus stops and someone dressed in black alights the bus. On the day of arrival of Kenji's older sister, the locals dressed up as monsters so Kenji can impress her by defeating them. Rin received a call from S.H.O.T. that demons are sighted at Akebono Park. Amachi orders Fudou and Kenji to head towards the location. The unknown person in black reaches Akebono Shopping District and that is the sign for the locals to scare the person. The unknown person revealed to be a fat man, started to scream. On a bridge heading towards Akebono City, another bus stopped and someone dressed in blue hakama alights the bus. As the person dressed in blue hakama reaches Akebono Shopping District, the fat man saw her and scream for help. The lady in blue hakama started to attack the disguised demons in Akebono Shopping District and their disguises give way, revealed their faces. The lady in blue hakama questioned the local's identity and Rin asked the same to her. She is revealed to be Umi Saionji and she has come to Akebono City to visit Kenji.
A lady in office wear is seen pulling luggage. She is stopped suddenly by the appearance of Anomalocaris on her luggage. She flees and gets into a taxi and asked the taxi driver to start the car quickly. He rejected her as he is on break currently. Both of them get shocked as Anomalocaris managed to chase after them and started screaming. Fudou arrived at a remote location and transforms into RyuGunOu. Kenji also arrives at a remote location and transforms into RyuKenDo. The Madan Warriors meet up each other, arriving with their JuuOh's vehicle mode. RyuGunOu shot at Anomalocaris but it manages to flee. Setoyama suddenly announced another sighting of Anomalocaris is spotted at Akebono Temple. RyuGunOu decided that he will go after Anomalocaris located in Akebono Temple while RyuKenDo chased after Anomalocaris that just flee the scene.
As the Anamolicarus that RyuKenDo is chasing flee into the river, RyuKenDo changes into Aqua mode to summon Aqua Shark to resume pursue. RyuGunOu arrived at Akebono Temple and asked Gajiro to inform everyone in Shopping District to evacuate. In the ramen shop, Umi is asking Rin if Kenji is exerting himself. She rephrased her question when Rin doesn't get what she is asking. Umi asked again if Kenji is working hard to fight the demons. The shop owner wife responded that Kenji is working hard in fighting the demons. Gajiro arrived at the ramen shop and informs everyone that demons have appeared. Umi asked if the Police are coming to the scene. The shop owner replied that Akebono Police aren't coming, S.H.O.T. are the ones that will be coming. Rin quickly pulls Umi out of the ramen shop with the latter asking for an explanation of why Akebono Police aren't handling demons. Rin explained that it is S.H.O.T.'s job to defeat the demons and Kenji as Akebono Police Officer is not allowed to interfere.
After hearing what Rin said, Umi decided to bring Kenji back. As their conversation ended, a police officer arrived at Akebono Shopping District and announced the arrivals of Anamolicarus. Rin quickly asked the locals to hide deeper in their stores to avoid being detected by Anamolicarus. Before Rin can ask Umi to take cover from the demons, she saw her starting to fight Anamolicarus by herself. Umi chased after Anamolicarus as it is leaving the area. Rin is asking Umi why she is fighting demons. Umi explained that Narukami Dragon God Style have been used since ancient times to fight demons and Kenji is trained for this. Rin commented that Kenji didn't tell her about this. Umi replied that she knows about this as she is Kenji's fiancee. Aqua RyuKenDo is seen chasing after Anamolicarus and decided to use Knuckle Key to summon Madan Knuckle, to activates the powerful, long-distance blaster to attack Anamolicarus but missed. Tsukaima is seen trying to intercept Umi and Rin from passing but Umi managed to defeat one of the Tsukaima.
An army of Tsukaima appears and Umi started to fight them. Umi told Rin that Kenji sends that letter full of lies but Rin retorted that Kenji is an idiot but he is not a liar. Rin told Umi that she knows Kenji better than her. After hearing this, Umi is shocked. This causes a loophole in her attacks and letting Anamolicarus destroy her wooden practice sword into two. Before Anamolicarus can move closer to Umi and Rin, it got shot away by Aqua RyuKenDo's Knuckle Spark. Umi is curious at the identity of the blue warrior she saw. Rin replied he is RyuKenDo. As more Anamolicarus appears to cause damage to Aqua RyuKenDo, RyuGunOu appears. It seems that both the Madan Warriors is isolating the swarm of Anamolicarus together. As Aqua RyuKenDo and RyuGunOu fighting the swarm of Anamolicarus, Umi recognizes Aqua RyuKenDo's fighting style. She then understands that Aqua RyuKenDo is none other than her fiance, Kenji Narukami.
After the fight, the Madan Warriors thought the case is closed as they defeated all the Anamolicarus. They hear some sound and saw the whole fleet of Anamolicarus appearing in the sky. They cannot defeat them one at a time. Aqua RyuKenDo has an idea and asked RyuGunOu to let him deal with this matter. Aqua RyuKenDo arrives on the roof of a building and activates his finishing move, Freezing Slash to freeze the whole fleet of Anamolicarus. This results in the defeat of the whole fleet of Anamolicarus, letting Aqua RyuKenDo obtaining a Madan Key. Umi and Rin returned to the ramen shop. Kaori saw that the sky is snowing, commenting how pretty it is with the shop owner wife commented the snow smell of shrimp. Kenji and Fudou return to the ramen shop and Kenji asked Rin for the whereabouts of his older sister. Kaori replied that she is going home. Kenji is surprised by Umi's decision of returning home. Rin commented that Umi said that she believes in him. Rin added that if Kenji has such a pretty person as his fiancee, he should reveal to them.
When the bus is about to depart, Kenji runs after the bus to bid farewell to Umi. He wants to know why Umi believe in him. Umi replied Kenji via lips movement and smile at him as the bus leaves. Kenji agrees and said he will exert himself and he will work hard for the weak and fight the demons. Rin is seen watching Kenji's action secretly behind a corner, asking herself what is she doing. She is surprised at the thought of something towards an idiot like Kenji. Komachi is seen beside Rin, she is jealous of their actions. She wants to be reborn and fall in love again. She helped Rin to continue her unfinished sentence earlier which is love.
- Kenji Narukami (鳴神 剣二, Narukami Kenji?): Shogo Yamaguchi (山口 翔悟, Yamaguchi Shogo?)
- GekiRyuKen (ゲキリュウケン, Gekiryūken?, Voice): Kenji Nojima (野島 健児, Nojima Kenji?)
- Juushirou Fudou (不動 銃四郎, Fudō Jūshirō?): Gen (源, Gen?)
- GouRyuGun (ゴウリュウガン, Gōryūgan?, Voice): Yasunori Masutani (増谷 康紀, Masutani Yasunori?)
- Rin Sakyo (左京 鈴, Sakyō Rin?): Kumi Imura (井村 空美, Imura Kumi?)
- Yuuya Amachi (天地 裕也, Amachi Yūya?): Kei Shimizu (清水 圭, Shimizu Kei?)
- Kiichi Setoyama (瀬戸山 喜一, Setoyama Kiichi?): Kentarou Miyagi (宮城 健太郎, Miyagi Kentaro?)
- Komachi Kurihara (栗原 小町, Kurihara Komachi?): Fumie Hosokawa (細川 ふみえ, Hosokawa Fumie?)
- Kaori Nose (野瀬 かおり, Nose Kaori?): Hiroko Sato (佐藤 寛子, Sato Hiroko?)
- Umi Saionji (西園寺 海, Saionji Umi?) Ayano Okubo (大久保 綾乃, Okubo Ayano?)
- Ushiyama Shiozo (牛山 塩三, Shiozo Ushiyama?): Joji Enoki (榎 譲治, Enoki Joji?)
- Tomio Chono (蝶野 富雄, Chono Tomio?): Jun Kimura (木村 准, Kimura Jun?)
- Kumazo Inomata (猪俣 熊蔵, Inomata Kumazo?): Daisuke Iijima (饭岛 大介, Iijima Daisuke?)
- Kuniko Inomata (猪俣 邦子, Inomata Kuniko?): Chige Tominaga (须永 千重, Tominaga Chige?)
- Gajiro (ガジロー, Gajirō?): Ryota Sato (佐藤 亮太, Sato Ryota?)
- to be added
Featuring Madan Warrior's Weapon: Madan Knuckle
- Knuckle Key summons it, and it attaches to one's arm. It can release powerful power stored in it known as Knuckle Spark and can instantly eliminate Tsukaima.