|This article is about a/an episode in Kamen Rider Kiva.|
With You: Final Transformation (ウィズユー・最後の変身 Wizu Yū: Saigo no Henshin) is the forty-fifth episode of Kamen Rider Kiva. It is the debut of Otoya Kurenai as Kamen Rider Dark Kiva & the final appearance of Kiva's Flight Style.
In 1986, during their brief encounter with Dark Kiva, Otoya is rescued by Wataru from the grips of King, only to invoke his wrath and reveal his true form as the Bat Fangire. Escaping the monster and later Wataru, Otoya encounters Kivat-bat the 2nd who delivers a message from Maya telling them they cannot meet again. She reveals that the King is using their son Taiga as leverage against her, vowing to kill the baby if she ever comes in contact with Otoya again. In light of his nemesis' cruel methods, Otoya offers to rescue Taiga; an equally disgusted Kivat-bat the 2nd proposes to enter a pact with him that would allow Otoya to use the power of Kiva, even though it would endanger the man's life.
Wataru, who overhears the discussion, is requested by Maya to save Taiga; however, Otoya refuses to let Wataru something he wants to do. Overwhelmed by the situation, Wataru excuses himself only to encounter King, escalating into full-blown combat between the two Kivas, until Otoya arrives. The situation soon turns dire as Wataru is injured intercepting an attack meant for his father. Facing imminent danger, Otoya enters the pact with Kivat-bat the 2nd and becomes Dark Kiva and forces the King to retreat. With the Bat Fangire gone, Otoya is left to brave the pains of his pact, knocking Wataru unconscious. Found by Yuri, she offers advice to Wataru not to continue his plan as it would mean Mio would never know him.
Finding Maya, Wataru learns that Otoya is making a rescue attempt to Castle Doran to save the Arms Monsters and Taiga. Once inside Castle Doran, Otoya manages to free the Arms Monsters, but he is discovered by King. Narrowly escaping, Wataru meets with Otoya in the manor's halls and is told the only way to honor Mio is to live a strong life for her. When the King finds them, Otoya covers for Wataru to find Taiga as he transforms into Dark Kiva to fight the Bat Fangire, freeing the Arms Monsters in the process. The Bat Fangire summons a red Sabbat to control Castle Doran, but Wataru assumes Emperor Form to free the dragon from the creature. Meanwhile, the battle between Otoya and the Bat Fangire reaches its climax as Otoya collapses from the strain of Kiva's power.
In 2008, Taiga agonizes over his loss of Mio, with the Bishop only offering harsh words about his King's treasonous fiancée’s actions against their race, before revealing himself as Mio's true executioner and had allowed Wataru to take the blame so he would be too distraught to interfere in their affairs again.
However, in spite of the Bishop's confidence that their kind would be unchallenged, Taiga turns his wrath towards him in a violent rage from which the Bishop barely escapes with his life. This act angers the Bishop as he starts attacking human to gather the necessary life energy to exact his revenge against Taiga for his unkingly behavior, only to be interrupted by Keisuke as he assumes Rising Ixa to stop the Swallowtail Fangire.
- Wataru Kurenai (紅 渡 Kurenai Wataru): Koji Seto (瀬戸 康史 Seto Kōji)
- Otoya Kurenai (紅 音也 Kurenai Otoya): Kouhei Takeda (武田 航平 Takeda Kōhei)
- Keisuke Nago (名護 啓介 Nago Keisuke): Keisuke Kato (加藤 慶祐 Katō Keisuke)
- Yuri Aso (麻生 ゆり Asō Yuri): Yu Takahashi (高橋 優 Takahashi Yū)
- Kivat-bat the 3rd, Kivat-bat the 2nd (キバットバットⅢ世、キバットバットⅡ世 Kibattobatto Sansei, Kibattobatto Nisei, Voice): Tomokazu Sugita (杉田 智和 Sugita Tomokazu)
- Tatsulot (タツロット Tatsurotto, Voice): Akira Ishida (石田 彰 Ishida Akira)
- Jiro (次狼 Jirō): Kenji Matsuda (松田 賢二 Matsuda Kenji)
- Ramon (ラモン Ramon): Yuuki Ogoe (小越 勇輝 Ogoe Yūki)
- Riki (力 Riki): Eiji Takigawa (滝川 英治 Takigawa Eiji)
- Maya (真夜 Maya): Saki Kagami (加賀美 早紀 Kagami Saki)
- Mio Suzuki (鈴木 深央 Suzuki Mio): Yuria Haga (芳賀 優里亜 Haga Yuria)
- King (キング Kingu): Shinya Niiro (新納 慎也 Niiro Shin'ya)
- Bishop (ビショップ Bishoppu): Mitsu Murata (村田 充 Murata Mitsu)
- Taiga Nobori (登 太牙 Nobori Taiga): Shouma Yamamoto (山本 匠馬 Yamamoto Shōma)
- Akira Kido (木戸 明 Kido Akira): Houka Kinoshita (木下 ほうか Kinoshita Hōka)
- As part of Super Hero Time, this episode aired alongside Engine Sentai Go-Onger episode 44, GP 44: Protect Christmas Eve.
Blu-ray Box 3 comes with 16 episodes.