When You Know the Truth...

When You Know the Truth... (真実を知る時) is the twenty-seventh episode of Kamen Rider Gaim. This episode marks the debut of Rosyuo, the master of all Overlord Inves.

Synopsis
Kota is knocked unconscious by Ryugen's backhanded attack, and Baron fights Ryugen for acting so cowardly. Meanwhile, Takatora mulls over the idea of having to cull the Earth's population down to only one billion people through the use of the Sengoku Drivers, remembering back to the days of first developing them, unaware that even then Ryoma was conspiring against him. When Kota regains consciousness, he explores Helheim Forest once more, only to be approached by someone unexpected.

Plot
In Helheim Forest, after Baron drives off Ryugen for the cowardly attempt on his life, Kota finally regains consciousness and wanders around Helhiem Forest before running into Oren as he was starving and almost ate a Helhiem Fruit. Though he turns down a rice ball, Oren follows Kota to the Yggdrasill Corporation's Crack in hopes of seeing Zangetsu Shin. In the Yggdrasill Corporation Building, upon remembering how he suffered in testing the early prototype models of the Sengoku Driver, Takatora attempts to see if his company has the resources to save the remaining seventh of the human population before he and Ryoma are alerted to an Inves attack on the research camp. By the time Kota and Oren arrive, they find Zangetsu Shin and his Kurokage Troopers protecting the researchers from being attacked by an Inves Army led by Dēmushu in retaliation for the wound inflicted on him by Baron. As Bravo and the Kurokage Troopers protect the camp, Gaim tells Zangetsu Shin of the Overlords' existence and how they could solve the matter through peace talks as Dēmushu explains he has no intention to associate with humans other than slaughtering them. Working together to subdue Dēmushu, Gaim and Zangetsu Shin are overpowered by the Overlord until Bravo takes a hit meant for the latter. Before he can kill them, Dēmushu receives a painful psychic order from the Overlords' leader to return to the ruins. With their pawn seeing an alternative means to save all of humanity, and holding Sid at bay so Gaim can go after Dēmushu, Ryoma decides to eliminate Takatora.

Cast

 * Kota Kazuraba (葛葉 紘汰): Gaku Sano (佐野 岳)
 * Kaito Kumon (駆紋 戒斗): Yutaka Kobayashi (小林 豊)
 * Mai Takatsukasa (高司 舞): Yuumi Shida (志田 友美)
 * Mitsuzane Kureshima (呉島 光実): Mahiro Takasugi (高杉 真宙)
 * Oren Pierre Alfonzo (凰蓮・ピエール・アルフォンゾ): Metal Yoshida (吉田メタル)
 * Takatora Kureshima (呉島 貴虎): Yuki Kubota (久保田 悠来)
 * Ryoma Sengoku (戦極凌馬): Tsunenori Aoki (青木玄徳)
 * Yoko Minato (湊 耀子): Minami Tsukui (佃井 皆美)
 * Lock Dealer Sid (錠前ディーラー　シド): Kazuki Namioka (波岡 一喜)
 * Deemushu (デェムシュ): Tomokazu Sugita (杉田 智和)
 * Redyue (レデュエ): Kenjiro Tsuda (津田 健次郎)
 * Rosyuo (ロシュオ): Jōji Nakata (中田 譲治)
 * Sengoku Driver Voice (戦極ドライバー音声), Lockseed Voice (ロックシード音声): Seiji Hiratoko (平床 政治)
 * Genesis Driver Equipment Voice (ゲネシスドライバー各種アイテム音声): Shin-ichiro Miki (三木 眞一郎)
 * Narration (ナレーション): Hōchū Ōtsuka (大塚 芳忠)

Lockseeds

 * Lock Used:
 * Gaim:
 * Orange, Lemon Energy, Himawari (used for food energy)
 * Ryugen:
 * Budou
 * Baron:
 * Lemon Energy
 * Zangetsu:
 * Melon
 * Bravo:
 * Durian
 * Zangetsu Shin:
 * Melon Energy
 * Arms Change:
 * Gaim:
 * Orange Arms, Jimber Lemon Arms
 * Ryugen:
 * Budou Arms
 * Baron:
 * Lemon Energy Arms
 * Zangetsu:
 * Melon Arms
 * Bravo:
 * Durian Arms
 * Zangetsu Shin:
 * Melon Energy Arms