|This article is about a/an episode in Kamen Rider Ryuki.|
The Grieving Knight (嘆きのナイト Nageki no Naito) is the seventeenth episode of Kamen Rider Ryuki.
With Ren doubting his ability to go through killing other Kamen Riders, Shinji and Miyuki contemplate his possible paths and the potential doom that he faces. As Sanako decided to go out for her 'secret association meeting', Yui continues to investigate the truth behind the secret experiments her brother conducted. Meanwhile, Shuichi attempts to release a prisoner.
Ren was left injured, while Shibaura mocks him that he could not finish him off. Shinji on the other hand asks Jun that what's wrong with that and Jun said that it's a game. Tezuka eventually made a prediction of Jun that he will be confronted by the police. Jun, being ignorant eventually ignored the warning. Shinji tries to cheer Ren up that when Shibaura said is wrong, but Ren lost his temper and eventually faints.
- Shinji Kido (城戸 真司 Kido Shinji): Takamasa Suga (須賀 貴匡 Suga Takamasa)
- Ren Akiyama (秋山 蓮 Akiyama Ren): Satoshi Matsuda (松田 悟志 Matsuda Satoshi)
- Yui Kanzaki (神崎 優衣 Kanzaki Yui): Ayano Sugiyama (杉山 彩乃 Sugiyama Ayano)
- Shiro Kanzaki (神崎 士郎 Kanzaki Shirō): Kenzaburo Kikuchi (菊地 謙三郎 Kikuchi Kenzaburo)
- Shuichi Kitaoka (北岡 秀一 Kitaoka Shūichi): Ryohei (涼平 Ryōhei)
- Goro Yura (由良 吾郎 Yura Gorō): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Miyuki Tezuka (手塚 海之 Tezuka Miyuki): Hassei Takano (高野 八誠 Takano Hassei)
- Jun Shibaura (芝浦 淳 Shibaura Jun): Satoshi Ichijo (一條 俊 Ichijō Satoshi)
- Sanako Kanzaki (神崎 沙奈子 Kanzaki Sanako): Kazue Tsunogae (角替 和枝 Tsunogae Kazue)
- Eri Ogawa (小川 恵里 Ogawa Eri): Mahiru Tsubura (つぶら まひる Tsubura Mahiru)
- Takeshi Asakura (浅倉 威 Asakura Takeshi): Takashi Hagino (萩野 崇 Hagino Takashi)
- Hajime Nakamura (仲村 創 Nakamura Hajime): Junichi Mizuno (水野 純一 Mizuno Jun'ichi)
- Police: Chiaki Tanabe (田邉 年秋 Tanabe Chiaki)
- Customer: Sakiko Takao (高尾 祥子 Takao Sakiko)
- Victim: Masuhiko Koizumi (小泉 麻寸彦 Koizumi Masuhiko)
- Guard: Makoto Matsubara (松原 誠 Matsubara Makoto)
- Gelnewt (ゲルニュート Gerunyūto, Voice): Katsumi Shiono (塩野 勝美 Shiono Katsumi)
- Cards used:
- Strike Vent
- Swing Vent, Copy Vent
- Strike Vent
- Weapons/Powers summoned
- Drag Claw
- Evil Whip, Drag Claw (via Copy Vent)
- Metal Horn
- Advent Card appeared before episode's preview:
- Copy Vent
- This episode aired alongside Ninpu Sentai Hurricaneger episode 15, Scroll 15: Giant Water Bug and Contest.
- Viewership: 9.5%
- The DVD Release of Kamen Rider Ryuki Volume 5 features episodes 17-20.
- The Blu-ray Release of Kamen Rider Ryuki Volume 1 features episodes 1-17.