|This article is about a/an episode in Kamen Rider Ryuki.|
Combining Ouja (合体する王蛇 Gattai Suru Ōja) is the twenty-fifth episode of Kamen Rider Ryuki.
Shinji and Ren are forced to track down Yui as she confronts her brother about her connection to the Rider War and their childhood memories. Reiko tries to find Asakura's younger brother, believing that will change him for good, only to discover that Asakura used his younger brother to feed his Contract Monsters. As Ren, Shinji and Shuichi battle against Asakura, he unleashes a new Card that does something the Riders didn't expect to happen.
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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)
- 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)
- Sanako Kanzaki (神崎 沙奈子 Kanzaki Sanako): Kazue Tsunogae (角替 和枝 Tsunogae Kazue)
- Akira Asakura (浅倉 暁 Asakura Akira): Takamasa Ariyoshi (有吉 崇匡 Ariyoshi Takamasa)
- Omegazelle (オメガゼール Omegazēru, Voice): Yoshimasa Chida (千田 義正 Chida Yoshimasa)
- Cards used:
- Final Vent
- Sword Vent, Contract ► Evildiver, Unite Vent
- Weapons/Powers summoned:
- Dragon Rider Kick
- Veno Saber, Genocider
- Advent Card appeared before episode's preview:
- This episode aired alongside Ninpu Sentai Hurricaneger episode 22, Scroll 22: Wings and Ninja.
- Viewership: 10.1%
- First appearance of the Unite Vent card and Genocider.
- The DVD Release of Kamen Rider Ryuki Volume 7 features episodes 25-28.
- The Blu-ray Release of Kamen Rider Ryuki Volume 2 features episodes 18-34.