|This article is about a/an episode in Kamen Rider Gaim.|
Mitsuzane! The Final Transformation! (光実！最後の変身！ Mitsuzane! Saigo no Henshin!) is the forty-second episode of Kamen Rider Gaim. It features the debut of Kamen Rider Ryugen Yomi and the final appearance of Baron Lemon Energy Arms.
Kouta tries to prove that he has not changed, despite all Kaito has seen in Helheim, and helps the others clear Zawame of Inves. However, Mitsuzane and Ryoma discover that Mai, who has been taken ill, is now the host of the Golden Fruit, and wonders why Rosyuo has placed it in her.
Kouta and the others tend to the survivors when some Inves attack them, forcing and Gaim and Baron to fight back. Meanwhile, Mitsuzane finds Mai at Team Gaim's garage and she passes out. Ryoma appears soon after, and upon realizing that Mai is carrying the Golden Fruit in her body, decides to take her to a abandon hospital. After defeating the Inves, Kouta and Kaito have a serious discussion when Kaito wonders if mankind should evolve under Helheim Forest and he leaves, with Yoko following him. While Kouta keeps searching for Mai, Chucky and Peko help move Mai to an abandoned hospital where they are deceived and locked up by Mitsuzane and Ryoma, who flee with Mai somewhere else. Kaito winces in pain, and reveals to Yoko that a wound he had previously received from Redyue is beginning to mutate him, but he constantly wears the Genesis Driver to keep it at bay. Yoko resolves to stay by his side to the end. When Ryoma and Mitsuzane examine Mai's body, trying to find a way to remove the Golden Fruit without killing her, Sagara appears to them, and claims that it will only leave her body when she bestows it to a champion chosen by her. He further reveals that he is actually the will of the Helheim Forest himself, who travels across worlds to hasten the evolution of their lifeforms. After Sagara leaves, Ryoma convinces Mitsuzane to fight Kouta to prevent him from claiming the Golden Fruit, and to do so, he entrusts him the Yomotsuheguri Lockseed, claiming that he will take care of Mai in his absence. While Peko and Chucky escape from the hospital through the window, Mitsuzane finds Kouta and uses his new Lockseed to transform into Armored Rider Ryugen Yomi to fight him, despite being warned that the transformation may cost his life. Unable to dissuade him, Gaim transforms into Kachidoki Arms, then Kiwami Arms to fight back.
- Kouta Kazuraba (葛葉 紘汰 Kazuraba Kōta): Gaku Sano (佐野 岳 Sano Gaku)
- Kaito Kumon (駆紋 戒斗 Kumon Kaito): Yutaka Kobayashi (小林 豊 Kobayashi Yutaka)
- Mitsuzane Kureshima (呉島 光実 Kureshima Mitsuzane): Mahiro Takasugi (高杉 真宙 Takasugi Mahiro)
- Takatora Kureshima (呉島 貴虎 Kureshima Takatora): Yuki Kubota (久保田 悠来 Kubota Yūki)
- Mai Takatsukasa (高司 舞 Takatsukasa Mai): Yuumi Shida (志田 友美 Shida Yuumi)
- Chucky (チャッキー Chakkī): KANON
- Rica (リカ Rika): MIINA
- Rat (ラット Ratto): Ren Ozawa (小澤 廉 Ozawa Ren)
- Zack (ザック Zakku): Gaku Matsuda (松田 岳 Matsuda Gaku)
- Peko (ペコ Peko): Saku Momose (百瀬 朔 Momose Saku)
- Akira Kazuraba (葛葉 晶 Kazuraba Akira): Rika Izumi (泉 里香 Izumi Rika)
- Hideyasu Jonouchi (城乃內 秀保 Jonouchi Hideyasu): Ryō Matsuda (松田 凌 Matsuda Ryō)
- Oren Pierre Alfonzo (凰蓮・ピエール・アルフォンゾ Ōren Piēru Arufonzo): Metal Yoshida (吉田 メタル Yoshida Metaru)
- Kiyojiro Bando (阪東 清治郎 Bandō Kiyojirō): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Yoko Minato (湊 耀子 Minato Yōko): Minami Tsukui (佃井 皆美 Tsukui Minami)
- Ryoma Sengoku (戦極 凌馬 Sengoku Ryōma): Tsunenori Aoki (青木 玄徳 Aoki Tsunenori)
- DJ Sagara (DJサガラ Dī Jei Sagara): Tomomitsu Yamaguchi (山口 智充 Yamaguchi Tomomitsu)
- Sengoku Driver Equipment Voice (戦極ドライバー各種アイテム音声 Sengoku Doraibā Kanren Aitemu Onsei): Seiji Hiratoko (平床 政治 Hiratoko Seiji)
- Genesis Driver Equipment Voice (ゲネシスドライバー各種アイテム音声 Geneshisu Doraibā Kanren Aitemu Onsei): Shin-ichiro Miki (三木 眞一郎 Miki Shinichirō)
- Narration (ナレーション Narēshon): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- to be added
- Lock used:
- Orange, Lemon Energy, Kachidoki, Kiwami
- Lemon Energy
- Ryugen Yomi:
- Arms Change:
- Weapons summoned in Kiwami Arms:
- Weapons summoned in Yomotsuheguri Arms:
- As part of Super Hero Time, this episode aired alongside Ressha Sentai ToQger episode 25, Station 25: Right Out of a Fairy Tale.
- Closing Screen Lockseed Collection:
- This is the first time Ryugen's closing screen is used since episode 28.
- This is the first time Mitsuzane uses the Sengoku Driver since episode 29.
- This is the last time Kouta transforms directly into
- Gaim Jimber Lemon Arms
- GAim Kachidoki Arms
- Mahiro Takasugi's (Mitsuzane Kureshima) and Saku Momose's (Peko) 18th birthdays, falling on July 6th and July 8th 2014 respectively, was celebrated during filming of this episode.