|This article is about a/an episode in Kamen Rider Ryuki.|
Ren battles with Shuichi in the Mirror World to decide who will survive. Miyuki reveals his past to Shinji as he contemplates the costs of changing destiny, as Shiro orders Takeshi to eliminate Raia for his refusal to fight. In the meantime, Reiko goes out to investigate Takeshi's disappearance.
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- 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)
- Takeshi Asakura (浅倉 威 Asakura Takeshi): Takashi Hagino (萩野 崇 Hagino Takashi)
- Daisuke Okubo (大久保 大介 Ōkubo Daisuke): Kanji Tsuda (津田 寛治 Tsuda Kanji)
- Reiko Momoi (桃井 令子 Reiko Momoi): Sayaka Kuon (久遠 さやか Kuon Sayaka)
- Nanako Shimada (島田 奈々子 Shimada Nanako): Hitomi Kurihara (栗原 瞳 Kurihara Hitomi)
- Cards used:
- Sword Vent, Guard Vent
- Trick Vent, Darkwing, Survive Shippu
- Shoot Vent
- Sword Vent, Metalgelas, Final Vent (Ouja), Final Vent (Gai)
- Swing Vent
- Weapons/Powers summoned:
- Drag Saber, Drag Shield
- Trick Vent, Dark Visor-Zwei, Dark Blade
- Giga Launcher
- Veno Saber, Veno Crash
- Evil Whip
- Advent Card appeared before episode's preview:
- Survive Shippu
- One of the season's many instances of doing so: when Ouja threatens Ryuki with two Final Vent cards, Gai's stolen Final Vent shows his original rhinoceros emblem instead of the cobra emblem it got when Metalgelas recontracted to Ouja.
- The next episode preview shows a scene of Ren burning Evildiver's Advent Card with a lighter over a stream, but the scene doesn't appear in the next episode; instead, in the only similar scene he is simply looking at his Survive Card while standing at the stream.
- As of this episode, Miyuki Tezuka is the third victim of the Rider War's casualties.
- This episode aired alongside Ninpu Sentai Hurricaneger episode 20, Scroll 20: Punch and Rival.
- The DVD Release of Kamen Rider Ryuki Volume 6 features episodes 21-24.
- The Blu-ray Release of Kamen Rider Ryuki Volume 2 features episodes 18-34.