Kamen Rider Kiva: King of the Castle in the Demon World

Kamen Rider Kiva The Movie: King of the Castle in the Demon World (劇場版 仮面ライダーキバ 魔界城の王) is the theatrical film adaptation of the 2008 Kamen Rider Series, Kamen Rider Kiva, directed by Ryuta Tasaki and written by Toshiki Inoue. A director's cut came out in June 2009.

The film is produced by Ishimori Productions and Toei, the producers of all the previous television series and films of the Kamen Rider series. Following the tradition of all Heisei Kamen Rider movies, it is a double bill with the movie for 2008's Super Sentai series Engine Sentai Go-onger, ''[http://powerrangers.wikia.com/wiki/Engine_Sentai_Go-Onger:_Boom_Boom!_Bang_Bang!_Gekij%C5%8DBang!! Engine Sentai Go-onger: Boom Boom! Bang Bang! GekijōBang!!]'', both of which premiered on August 9, 2008. The film's title is translated into English as Masked Rider Kiva The Movie: King of the Castle in the Demon World. The double-feature opened at number 4 in Japanese box offices its opening weekend.

Production
King of the Hell Castle features two new Riders, the first of which was shown in silhouette in Japanese children's magazines, Kamen Rider Rey, who is a monster hunter named Takato Shiramine played by Shouma Yamamoto. He is partnered to Rey Kivat, voiced by Norio Wakamoto. The villain of the movie is Takashi Sugimura who is a death-row inmate and transforms into the black and horned Kamen Rider Arc, portrayed by Ken Horiuchi of the comedy troupe Neptune. Arc is to be the tallest Rider without the use of powers at 3.2 m tall. Also guest starring is Gal Sone, who plays a Medusa-like villainess named Sayaka who, among other creatures known as the Legendorga, aids Arc in his quest to rule the world. As part of the role, Gal Sone will show off her competitive eating skills. Toshihiko Seki, Kōji Yusa, Masaki Terasoma, Kenichi Suzumura, Rina Akiyama, and Ryo Ueno of the Den-O cast are all to have cameo appearances in the film.

Story
The story begins in 2008 as the Antlion Fangire begins to feed at an exhibit room until Megumi intervened as Nago arrives to slay the monster. However, during their struggle, the Mummy Legendorga suddenly resurrects and feeds on the humans before using his power to turn the Antlion Fangire into his slave to aid him in overwhelming Nago with the Arms Monsters watching the fight. While this occurred, Wataru Kurenai starts attending a local high school at Shizuka's suggestion after a welfare officer visited him and quickly befriends Natsuki Tsukue, who tries to get Wataru to join several clubs where he fails in each one while trying to ask her if she would like to start a violin club after hearing her play, she refuses out right.

Later that night, death row inmate Takashi Sugimura escaped from prison and the pursuing police officers by means of a dark power possessing him, with Nago going after him under advisement from Mamoru Shima to capture the fugitive with caution as he may be a Fangire. When Nago finds Sugimura, he chases the fugitive all the way to Wataru's high school and takes Natsuki hostage, but she is freed by the joint efforts of Wataru and Nago. However, the Medusa and Mummy Legendorgas appear to Sugimura's aid when he was being escorted back to jail, overpowering Ixa as Kiva arrives. They overpower the riders until another figure named Takato Shiramine appears, transforming into Kamen Rider Rey and driving the two Legendorgas off as they take Sugimura with them, waking him as their Lord.

At the cafe, as Shiramine explains the Legendorgas, Wataru finds that the current crisis started when Sugimura attempted to break out of jail by using the famous violinist Towa Sakakibara as a hostage in 1986 and broke the Legendorgas' seal. With this knowledge, Wataru asks the Arm Monsters permission to use Castle Doran's Time Door to go back in time to prevent Sugimura's actions. While trying to get Sakakibara to cancel her concert, he is stopped by Otoya who was convinced he was a Fangire and tries to beat him. After another attempt to talk to her, Wataru is attacked by Yuri after Otoya tells her about him as the police arrive to arrest Otoya on the impression he's the criminal. Forced to take Wataru in a stolen police car, Otoya is shocked when Wataru recognized him as his father. Wataru attempts to prove himself with his cellphone and money before he and his father are both sent to Kanto West Prison where Towa is to perform as Sugimura takes her hostage to escape. But Otoya knocks out a guard named Sanjou so he and Wataru can get out of their cell to save Towa and restrain Sugimura.

After Wataru returns to his time under the impression he succeeded, Sanjou turns out to be the Zebra Fangire that attacks Otoya before trying to kill Towa. But Yuri arrives to allow Otoya to kill the Fangire as Ixa, causing the chain of events where Sugimura escapes and uncovers the tomb of the Legendorga Lord, invoking the spirit within it. When Wataru returns to his time, he is targeted by people under the control of the Mummy and Medusa Legendorgas, with the Gargoyle Legendorga overseeing their attack. Luckily, Otoya and Yuri arrive to aid their future children, later bonding with them before Otoya reveals that Towa Sakakibara is the stage name of Natsumi Tsukue, Natsuki's mother. Otoya is enjoying the present and its perks after disguising Wataru so he wouldn't be attacked, meeting up with Shiramine before he is distracted by a young woman named Sayaka as Shiramine tells Wataru that Kiva's destruction will soon come as Sayaka reveals herself as the Medusa Legendorga.

Becoming Kiva to fight the Legendorgas, he summons Buroon Booster which he uses to destroys the Mandrake Legendorga as the Arm Monsters arrive to aid Kiva in fighting the remaining three in both their true forms and in their weapon forms. However, as his friends drive the monsters off, Kiva is attacked by Rey who reveals that he is on the Legendorgas' side as he then takes the Aso girls hostage. Later at the cafe, after Otoya plays Natsumi's song to help Natsuki finally accept her mother, Rey-kivat arrives with orders to take Wataru to the Legendorgas' castle. After knocking his father out, Wataru arrives at the castle and is brought before Sugimura, who reveals himself to be the vessel of the Legendorga Lord Arc who was defeated by the original Kiva and uses his power to force Wataru's Fangire blood to manifest into Kiva's Flight Style. Under Arc's control, Wataru is forced to have Otoya relinguish his Ixa Knuckle as Nago arrives to help. But once he loses his Ixa Knuckle, Yuri and Megumi arrive after freeing themselves and use their time-respective Ixa Knuckles to fight the Legendorgas with Otoya managing to snap his son out of Arc's spell as the Aso girls kill the Medusa Legendorga.

Enraged, Sugimura decides to kill Wataru as they both assume their Rider Forms as the Ixa Knuckles are returned to Otoya and Nago who fight the Mummy Legendorga and Rey, respectively. Nago eventually gets the best of Rey, destroying him with the Ixa Judgement, while Otoya eventually destroys the Mummy Legendorga, even though his Save Mode helmet is heavily damaged in the process. While this occurred, Kiva is forced to assume Emperor Form to deal with the larger opponent, weakening him enough so he can be defeated by both of the Kurenai family Riders. However, Arc absorbs the power of the Legendorga race by sucking the eye on the moon into himself to become Legend Arc to kill them. Kiva then transforms into Emperor Form's Flight Style to fight Legend Arc in a battle across the city, until Castle Doran comes to Kiva's aid, finally allowing Kiva to perform a Rider Kick with enough force to slam Arc into the moon, leaving a gigantic crater and destroying him for good. After everything returns to normal, Otoya performs alongside his son on their violins at Wataru's school before he and Yuri return to their time. Once they left, Wataru is joined by Natsuki as the two perform a duet.

Shortly after the credits, Ryutaros just finished watching watching this movie. Momotaros barges in mad because Ryutaros didn't wait for him. The two watch short cartoons films featuring the Taros themselfs. Momotaros is mad of the outcomes because he was the one that always dies and Ryutaros always comes out on top. Ryutaros transforms into Go-On Red and Ixa during the shorts. Kintaros and Urataros comes in and say they just solved the theater mystery.

Continuity & Placement
Despite this movie is consider non-canon to the series itself, there is still a good placement, which is between episode 24 and episode 27. Due to the appearance of Kiva Emperor but the absence of Rising Ixa.

2008 side

 * Wataru Kurenai/Kamen Rider Kiva (紅 渡／仮面ライダーキバ): A shy young man who teams up with Kivat to fight the Fangire race and protect humanity from them.
 * Kivat-bat the 3rd (キバットバットⅢ世): Called "Kivat" for short, he is a solid character with dry wit, tending to have a bitter attitude. He formed a partnership with Wataru to give him the power of Kiva.
 * Tatsulot (タツロット): The opposite of Kivat personality-wise, he appears whenever Kiva needs to use his full power.
 * Megumi Aso (麻生 恵): A member of the Fangire Hunters who follows in her mother's footsteps.
 * Keisuke Nago/Kamen Rider Ixa (名護 啓介／仮面ライダーイクサ): A member of the Fangire Hunters and user of the Ixa System.
 * Shizuka Nomura (野村 静香): A preteen girl who is able to get around the shyness of Wataru, being a motherly figure to him as he teaches her how to play the violin.
 * Kengo Eritate (襟立 健吾): A young rocker who befriended Wataru.

1986 side

 * Otoya Kurenai (紅 音也): Wataru's father, a ladies' man and a master violinist. His exploits of battle against the Fangire take place in 1986.
 * Yuri Aso (麻生 ゆり): A member of the Fangire Hunters who keeps Otoya in his place.

No side

 * Jiro (次狼): The Human form of the Wolfen Garulu (ガルル), offering his power to Kiva in the form of the Garulu Saber.
 * Ramon (ラモン): The Human form of the Merman Basshaa (バッシャー), offering his power to Kiva in the form of the Basshaa Magnum.
 * Riki (力（リキ）): The Human form of the Franken Dogga (ドッガ), offering his power to Kiva in the form of the Dogga Hammer.
 * Akira Kido (木戸 明): Owner of the cafe that serves as the Fangire Hunters' meeting place.
 * Mamoru Shima (嶋 護): The leader of the Fangire Hunters and member of the Wonderful Blue Sky Organization.

Characters

 * Natsuki Tsukue (机 なつき): Wataru's classmate in a high school.
 * Towa Sakakibara (Natsumi Tsukue) (榊原 とわ（机 なつみ）): Natsuki's mother, a violinist who studies under Otoya in 1986.
 * Sayaka (サヤカ): The human form of the Medusa Legendorga (メドゥーサレジェンドルガ).

Legendorga
Legendorga is the main antagonist of the film.

Internet spin-off film
On June 2, 2008, Toei announced on its various official websites that there would be a series of short five-minute internet movies that are spin-offs of both King of the Castle in the Demon World and  to be accessed by a mobile phone service. In the case of King of the Castle in the Demon World, the featurettes are called Net Edition: Kamen Rider Backwards-Kiva: Queen of the Castle in the Demon World (ネット版 仮面ライダー裏キバ 魔界城の女王), the first webisode released on July 11, 2008. In these shorts, Otoya and Yuri are brought into the present by Castle Doran when the mysterious Queen of the Legendorga is about to be revived. The shorts themselves are all zany misadventures of everyone in the Kiva cast. In the end, the Legendorga Queen is revealed to be Shizuka, however in the battle's climax, it is revealed that the entire event was only a dream.

Webisodes

 * 1) Wataru Kurenai's Backwards Face?! (紅渡の裏の顔?!)
 * 2) Castle Doran Backwards Battle?! (キャッスルドランで裏バトル?!)
 * 3) Keisuke Nago's Backwards Face?! (名護啓介の裏の顔?!)
 * 4) Café Otoya d'amour (カフェ・音也・ダムールｩ)
 * 5) The Queen Descends! (女王降臨!)

Cast

 * Wataru Kurenai (紅 渡): Koji Seto (瀬戸 康史)
 * Otoya Kurenai (紅 音也): Kouhei Takeda (武田 航平)
 * Keisuke Nago (名護 啓介): Keisuke Kato (加藤 慶祐)
 * Megumi Aso (麻生 恵): Nana Yanagisawa (柳沢 なな)
 * Yuri Aso (麻生 ゆり): Yu Takahashi (高橋 優)
 * Kengo Eritate (襟立 健吾): Kohei Kumai (熊井 幸平)
 * Shizuka Nomura (野村 静香): Rina Koike (小池 里奈)
 * Jiro (次狼): Kenji Matsuda (松田 賢二)
 * Ramon (ラモン): Yuuki Ogoe (小越 勇輝)
 * Riki (力（リキ）): Eiji Takigawa (滝川 栄治)
 * Akira Kido (木戸 明): Houka Kinoshita (木下 ほうか)
 * Mamoru Shima (嶋 護): Kazuhiko Kanayama (金山 一彦)
 * Takato Shiramine (白峰 天斗): Shouma Yamamoto (山本 匠馬)
 * Natsuki Tsukue (机 なつき): Rei Okamoto (岡本 玲)
 * Towa Sakakibara (Natsumi Tsukue) (榊原 とわ（机 なつみ）): Sayuri Anzu (杏 さゆり)
 * Sayaka (サヤカ): Gal Sone (ギャル曽根)
 * Takashi Sugimura (杉村 隆): Ken Horiuchi (堀内 健) of Neptune
 * Kivat-bat the 3rd (キバットバットⅢ): Tomokazu Sugita (杉田 智和)
 * Tatsulot (タツロット（声）): Akira Ishida (石田 彰)
 * Arc Kivat, Rey Kivat (アークキバット、レイキバット): Norio Wakamoto (若本 規夫)
 * Penetentiary Officer Sanjō (三条刑務官): Toshihiko Seki (関 俊彦)
 * Shogi Player (将棋部員): Kōji Yusa (遊佐 浩二)
 * Teacher (教師): Masaki Terasoma (てらそま まさき)
 * Soccer Player (サッカー部員): Kenichi Suzumura (鈴村 健一)
 * Policewoman (婦人警官): Rina Akiyama (秋山 莉奈)
 * Police Officer (警官): Ryo Ueno (上野 亮)
 * Prison Guard (刑務官): Yoshifumi Oshikawa (押川 善文)
 * Prison Guard (刑務官): Eitoku (永徳)
 * Policeman (刑務官): Seiji Takaiwa (高岩 成二)

Suit actors

 * Kamen Rider Kiva: Seiji Takaiwa (高岩 成二)
 * Kamen Rider Ixa: Jiro Okamoto (岡元 次郎), Yūichi Hachisuka (蜂須賀 祐一)
 * Kamen Rider Rey: Eitoku (永徳)
 * Kamen Rider Arc: Keizo Yabe (矢部 敬三), Kazuo Niibori (新堀 和男)

Songs
Theme song Circle of Life is Nanase Aikawa's first new release since giving birth to her second son in 2007. The other members of Crimson-FANG have not been revealed, but Aikawa collaborated with foreign artists to produce the single for the film. The single will have two different versions released, Circle of Life 1986 ver. and Circle of Life 2008 ver. Each single has the title track "Circle of Life" and both a "Violin Re-Connection Ver." and instrumental of the title track. The "2008ver." single has a song titled "With You" with Koji Seto as Wataru Kurenai performing with Crimson-FANG and its instrumental whereas the "1986ver." single has a song titled "With Me" with Kouhei Takeda as Otoya Kurenai performing with Crimson-FANG and its instrumental. The cover art also differs, with Kiva Kiva Form on the cover of the "2008ver." single and Ixa Save Mode on the cover of the "1986ver." single. The single debuted at #17 on the Oricon Daily Rankings charts and a debut at #32 on the Weekly Rankings.
 * "Circle of Life"
 * Lyrics: Shoko Fujibayashi
 * Composition: Tsuneyoshi Saito & Shuhei Naruse
 * Arrangement: Shuhei Naruse
 * Artist: Crimson-FANG
 * Vocals: Nanase Aikawa
 * Guitar: Marty Friedman

Trivia

 * There were several references to Kamen Rider Den-O.
 * The actors who voiced the main four protagonist Imagin cameo from Kamen Rider Den-O in this film (the audience can tell because they all have a variant on their respective catchphrases).
 * Momotaros : Officer Sanjo (named after Momotaros's iconic line: "Ore Sanjou" which was what he said to Otoya during the prison scene)
 * Urataros : Student playing chess with Wataru (During the game, He asked to Wataru "May if I reel you in", similar to how Urataros would ask the Imagins in Den-O series "mind if i reel you in?")
 * Kintaros : Teacher (He erases writing on the bulletin board that says "my strength will make you cry" which was what Kintaros would usually say)
 * Ryutaros : Soccer player (He asked to Wataru "Can I defeat you, I can't hear you!" similar to how Ryutaros would always: "Mind if I defeat you? Can't hear you!)
 * Rina Akiyama appeared as one of the policewomen who arrested Wataru and Otoya, with the latter attempting to flirt with her. Her appearance as a policewoman is likely a reference to their previous crossover movie where the Den-Liner Crew worked as detectives.
 * During the school festival, four people in dog, penguin, elephant, and dragon costumes were goofing around with each other. The one with the dog costume was holding a sign that reads "Yakisoba Sanjou". The four Taros wore these costumes in their main series and they were also wearing these at the beginning of the next Kamen Rider movie, Saraba Kamen Rider Den-O: Final Countdown. Someone in a tiger costume was also with them and Deneb has used it before.