|This article is about a/an episode in Kamen Rider Den-O.|
|That Person Just Now! In the Past?|
|Kamen Rider Den-O, Episode 17|
|Air date May 20, 2007|
|Written by Yasuko Kobayashi|
|Directed by Tarou Sakamoto|
Star of Happiness, Criminal's Surrender
A Clockwork Fiancé
Ryotaro and Hana decide to clamp down on the Imagin possessing him out of fear of Den-O's health; as Ryotaro encounters a former classmate nostalgic for the past.
Ryotaro is hospitalized, again, due to the stress of the Imagin in his body, and because of this Hana terminates the employment of the Tarōs Imagin. One of Ryotaro's high school friends, Yuka Sawada, pays him a visit after spending a year in England and when she starts to pine about her former high school days, she inadvertently opens a contract with the Wolf Imagin.
While Airi left Ryotaro to look after the Milk Dipper, Momotaros, Urataros, and Kintaros seek to show which one of them is more useful by trying to have him serve coffee to Miura and Ozaki.
While on the DenLiner, Ryutaros reveals that an Imagin had made a contract with Yuka. The Wolf Imagin had been vaporizing high school girls and taking their belongings to Yuka to complete its contract with her so she can relive her high school days. When Hana and Ryotaro find her, the Wolf Imagin travels back to April 7, 2004, the day that Yuka was transferred to the school in England.
In the middle of the fight, Ryotaro is knocked into the mysterious man in the trenchcoat, and the man drops his pocket watch. Ryotaro recognizes the watch, but the man leaves and Ryotaro is attacked by the Wolf Imagin. After the fight, Ryotaro sees the mysterious man, and gives chase, recognizing him as his sister's fiancé, Yuto Sakurai.
- Ryotaro Nogami (野上 良太郎 Nogami Ryōtarō): Takeru Satoh (佐藤 健 Satō Takeru)
- Hana (ハナ Hana): Yuriko Shiratori (白鳥 百合子 Shiratori Yuriko)
- Naomi (ナオミ Naomi): Rina Akiyama (秋山 莉奈 Akiyama Rina)
- Opening Narration (オープニングナレーション Ōpuningu Narēshon): Kenjirō Ishimaru (石丸 謙二郎 Ishimaru Kenjirō)
- 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)
- 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)
- Yuka Sawada (沢田 由香 Sawada Yuka): Hikari Mitsushima (満島 ひかり Mitsushima Hikari)
- Oiwa (大岩 Ōiwa): Yasunori Yokoe (横江 泰宣 Yokoe Yasunori)
- Nurse: Kimiyo Matsumoto (松本 江世 Matsumoto Kimiyo)
- Yoshiko Sawada (沢田 良子 Sawada Yoshiko): Noriko Sunami (角南 範子 Sunami Noriko)
- Wolf Imagin (ウルフイマジン Urufu Imajin, Voice): Nobuyuki Hiyama (檜山 修之 Hiyama Nobuyuki)
- 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)
- Wolf Imagin: Makoto Ito (伊藤 慎 Itō Makoto)
- Den-O: Plat Form, Gun Form
- This is the first time Den-O changes into Gun Form from a different form other than Sword Form (Plat Form).