|This article is about a/an episode in Kamen Rider Gaim.|
The New Arms! Jimber Lemon is Born! (新アームズ！ジンバーレモン誕生！ Shin Āmuzu! Jinbā Remon Tanjō!) is the sixteenth episode of Kamen Rider Gaim. This episode introduces the concept of replacing the Sengoku Driver's Rider Indicator with the Genesis Driver's core, thus marking the debut of Gaim's Jimber Lemon Arms.
After escaping the clutches of the Yggdrasill Corporation, Kouta wonders why all three of them were able to escape so easily, knowing how Ryoma Sengoku was interested in them. Later, Mai and Chucky continue to try to convince other teams to end the Inves Game, but they instead witness an Elementary Inves robbing a jewelry store. Meanwhile, Takatora has shown Mitsuzane a horrible scene hidden within the Helheim Forest and revealed that he easily beat Kouta.
Ryugen escapes from the Yggdrasill Corporation complex while Gaim and Baron evade their pursuers as well and return from the Helheim Forest. Later, Kouta and Mitsuzane visit Rat in the hospital, happy that he is not infected by the Inves disease, and learn that Mai is trying to end the Inves Games. Meanwhile, Takatora confronts Sid over Mitsuzane becoming an Armored Rider, the Lockseed Dealer feigning ignorance, and after he leaves, Ryoma reveals that while intrigued about how Kouta and Kaito escaped, someone has stolen some of his equipment. Mai and Chucky walk through town, discussing how everything has changed since the start of the Inves games, when they hear an alarm go off and discover that a jewelry store has been robbed by an Inves. They follow the Inves and discover that Team Red Hot is controlling it. Sonomura reveals to them that the Beat Riders have begun jailbreaking their Lockseeds to use their Inves outside of the games and sends his Inves against them, but Kaito appears in the nick of time to rescue them. Meanwhile, Mitsuzane returns home to see Takatora in his room watching the video of Yuya's transformation. Mitsuzane confronts his brother, who commends him for choosing to follow his own path and decides to reveal all the truth to him. Back in the garage, Kouta tries to figure out how to use the Lemon Energy Lockseed with the Sengoku Driver with no success, until Mai arrives to reveal what has happened to her. Kouta confronts Sonomura about the robbery, but he simply offers an alliance between Team Gaim and Team Red Hot. Kouta refuses, and Sonomura reveals that Sid had made him an offer to take back Kouta's Sengoku Driver, and uses a jailbroken Mango Lockseed to summon a Lion Inves to attack him. During the fight, the Mango Lockseed begins to short out, causing the Lion Inves to go rogue, growing wings in the process. Gaim manages to save Sonomura from being killed by the Inves, before it escapes and starts attacking civilians. When the Lion Inves knocks the Rider Indicator off of Gaim's Sengoku Driver, Gaim attempts to place the Genesis Core in the empty space, and successfully activates the Lemon Energy Lockseed in tandem with the Orange Lockseed, transforming him into Gaim Jimber Lemon Arms, easily destroying the Lion Inves with the Sonic Arrow and energy from both Lockseeds. In Helheim Forest, Mitsuzane is horrified when he is shown by Takatora what he claims to be the forest's darkest secret, and he agrees to work with his brother to conceal it from the public. At Drupers, Kouta thinks over everything that has changed, and Bando encourages him that change happens for a reason, until Rat arrives, now discharged from the hospital, much to his joy.
- 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)
- 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)
- Takatora Kureshima (呉島 貴虎 Kureshima Takatora): Yuki Kubota (久保田 悠来 Kubota Yūki)
- Ryoma Sengoku (戦極 凌馬 Sengoku Ryōma): Tsunenori Aoki (青木 玄徳 Aoki Tsunenori)
- Yoko Minato (湊 耀子 Minato Yokō): Minami Tsukui (佃井 皆美 Tsukui Minami)
- Kiyojiro Bando (阪東 清治郎 Bandō Kiyojirō): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Lock Dealer Sid (錠前ディーラー シド Jōmae Dīrā Shido): Kazuki Namioka (波岡 一喜 Namioka Kazuki)
- 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)
- Iyo (イヨ): Yui Natsuki (那月 結衣 Natsuki Yui)
- Sonomura (曽野村): Takashi Kitadai (北代 高士 Kitadai Takashi)
- Henchmen: Yugo Fujii (藤井 祐伍 Fujii Yūgo)
- Lock Used:
- Orange, Sakura Hurricane, Ichigo, Lemon Energy
- Banana, Rose Attacher
- Kurokage Troopers
- Matsubokkuri, Dandeliner
- Arms Change:
- Lock Vehicle:
- As part of Super Hero Time, this episode aired alongside Zyuden Sentai Kyoryuger episode 47, Brave 47: The Great Counterattack! The Greatest Final Brave.
- Closing Screen Lockseed Collection:
- This is the first episode to not feature any of the New Generation Riders
- At the final part of the scene where Takatora and Mitsuzane are in Helheim, there are growths behind Mitsuzane in one shot that resemble tube worms with humanoid mouths.
- The scene where Gaim and Baron were chased by the Kurokage Troopers in Dandeliners is similar to Star Wars Episode VI: Return of the Jedi, where both Luke and Leia are chased by Imperial Scout Troopers on Speeder Bikes at the Forest of Endor.
- Red Hot's hidden ground in this episode is similar to the place used for Greeed's hiding place in Kamen Rider OOO.
- The Houri Hospital, which occupied victims of the Inves attacks in episode 13, makes a brief appearance in this episode.
Kamen Rider Gaim Volume 4 features episodes 13-16: Gaim and Baron, Tag of Friendship! , The Secret of Helheim's Fruits, The Man Who Developed the Belts, and The New Arms! Jinba Lemon Arms is Born!. 
- TV Asahi's official summary for 「新アームズ！ジンバーレモン誕生！」
- Toei TV's official episode guide for 「新アームズ！ジンバーレモン誕生！」