|This article is about a/an episode in Kamen Rider Den-O.|
The Rider Disappears As Well (そしてライダーもいなくなる Soshite Raidā mo Inakunaru) is the thirty-ninth episode of Kamen Rider Den-O.
While Ryotaro tries to figure out the true purpose of Yuto's interactions with both present and past actions, Kai decides to experiment in eliminating Zeronos in the past.
After Den-O Sword Form destroy the Panda Rabbit Imagin as he just completed the contract, Ryotaro uses the card from the contact holder to go the time the Imagin was to terrorize. Once at September 13, 2006, Ryotaro and Kohana find Sakurai wandering there, adding to the mystery behind Kai. Meanwhile, Kai decides to express his anger towards Ryotaro with the female Snail Imagin aiding him. The next day, Ryotaro crashes into Yuto after he and Deneb went grocery shopping. After Yuto leaves him while they were discussing Airi's memory, Kai appears and engages Ryotaro in a talk about the morals of time alterations before Momotaros takes over and the Tarōs state their disgust for Kai. Annoyed with the "traitors", Kai sends the female Snail Imagin back in time to March 27, 1993, before Yuto acquired the Zeronos arsenal. Ryotaro and Yuto arrive only to see the Imagin kill the younger Yuto by destroying the field trip van. As a result, Yuto fades away before Ryotaro's eyes. Though she gloats, Ryotaro transforms to Liner Form and destroys the female Snail Imagin. Though Ryotaro expected Yuto to reappear as everything she obliterated was restored, only to realize he has no memory of Yuto at that time and the Zeronos Cards ensure no one at that time remembers Yuto, either. When Ryotaro returns to the present, he finds the Milk Dipper completely changed as in this timeline, Airi and Sakurai had never met.
- Den-O: Sword Form, Liner Form
- Ryotaro Nogami (野上 良太郎 Nogami Ryōtarō): Takeru Satoh (佐藤 健 Satō Takeru)
- Kohana (コハナ Kohana): Tamaki Matsumoto (松元 環季 Matsumoto Tamaki)
- Yuto Sakurai (桜井 侑斗 Sakurai Yūto): Yuichi Nakamura (中村 優一 Nakamura Yūichi)
- Naomi (ナオミ Naomi): Rina Akiyama (秋山 莉奈 Akiyama Rina)
- Airi Nogami (野上 愛理 Nogami Airi): Wakana Matsumoto (松本 若菜 Matsumoto Wakana)
- Seigi Ozaki (尾崎 正義 Ozaki Seigi): Akira Nagata (永田 彬 Nagata Akira)
- Issē Miura (三浦 イッセー Miura Issē): Ryo Ueno (上野 亮 Ueno Ryō)
- Kai (カイ Kai): Hideo Ishiguro (石黒 英雄 Ishiguro Hideo)
- Momotaros (モモタロス Momotarosu, Voice): Toshihiko Seki (関 俊彦 Seki Toshihiko)
- Urataros (ウラタロス Uratarosu, Voice): Kōji Yusa (遊佐 浩二 Yusa Kōji)
- Kintaros (キンタロス Kintarosu, Voice): Masaki Terasoma (てらそま まさき Terasoma Masaki)
- Ryutaros (リュウタロス Ryūtarosu, Voice): Kenichi Suzumura (鈴村 健一 Suzumura Ken'ichi)
- Deneb (デネブ Denebu, Voice): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- Owner/Opening Narration (オーナー／オープニングナレーション Ōnā/Ōpuningu Narēshon): Kenjirō Ishimaru (石丸 謙二郎 Ishimaru Kenjirō)
- Contract holder: Kosuke Takahashi (高橋 孝輔 Takahashi Kōsuke)
- Teacher: Katsunori Abe (あべ かつのり Abe Katsunori)
- Seiko Nozaki (野崎 聖子 Nozaki Seiko): Ai Hasegawa (長谷川 愛 Hasegawa Ai)
- Itsuko Niura (二浦 逸子 Niura Itsuko): Kazumi Horisawa (堀澤 かずみ Horisawa Kazumi)
- Panda Rabbit Imagin (パンダラビットイマジン Panda Rabitto Imajin, Voice): Kōji Ochiai (落合 弘治 Ochiai Kōji)
- Snail Imagin (スネールイマジン Sunēru Imajin, Voice): Nanaho Katsuragi (葛城 七穂 Katsuragi Nanaho), Takashi Irie (入江 崇史 Irie Takashi)
- Kamen Rider Den-O/Momotaros: Seiji Takaiwa (高岩 成二 Takaiwa Seiji)
- Urataros: Eitoku (永徳 Eitoku)
- Kintaros: Jirō Okamoto (岡元 次郎 Okamoto Jirō)
- Ryutaros: Toshihiro Ogura (おぐら としひろ Ogura Toshihiro)
- Kamen Rider Zeronos: Makoto Ito (伊藤 慎 Itō Makoto)
- Deneb: Yoshifumi Oshikawa (押川 善文 Oshikawa Yoshifumi)
- Panda Rabbit Imagin, Snail Imagin: Norihito Itō (伊藤 教人 Itō Norihito)
- As part of Super Hero Time, this episode aired alongside Juken Sentai Gekiranger episode 35, Lesson 35: Gyuon-Gyuon! Beast Power Blooming.
- Viewership: 5.9%
- The younger version of Yuto, although still portrayed by Nakamura, has completely different hair from his future self, including a lighter color.
Blu-ray Box 3 comes with 13 episodes.