|This article is about a/an episode in Kamen Rider Gaim.|
Now Depart for the Front Line! Kachidoki Arms! (いざ出陣！カチドキアームズ！ Iza Shutsujin! Kachidoki Āmuzu!) is the twenty-third episode of Kamen Rider Gaim. It features the debut of Gaim Kachidoki Arms, as well as the proper debut of Demushu, the first of the Over Lord Inves.
Now aware that he killed Yuya, Kouta loses all will to fight, and will not even seek to destroy the Scalar System. As he struggles with the thought of telling the truth to his friends, Kaito encounters the strange Inves in Helheim Forest, once more.
Devastated upon learning the truth about Yuya, Kouta loses all will to fight, and Mitsuzane suggests to him not to tell anything about it to their friends. Meanwhile, Ryoma discusses the mission he gave to Kaito with his allies, which is to get more information about the "Over Lords", which are human intelligence Inves who have managed to evolve and adapt to the Helheim Forest, claiming that it is the path mankind should follow to avoid extinction. As Kaito finally encounters and confronts the Over Lord Inves he has been looking for, who attempts to introduce himself to Kaito as Dēmushu, Kouta meets Mai in the place where they would have met with Yuya when he last contacted them, and he refrains from telling her the truth as Mitsuzane suggested.
Back at Drupers, Kouta has another vision of the mysterious girl who supports his decision to stop fighting. Soon after, DJ Sagara appears before him, claiming that instead of just sacrificing others, there are others who pursue their dreams by fighting their way without renouncing anything, just like Kaito, and he presents Kouta with the Kachidoki Lockseed and a Dandeliner Lockseed. With his will renewed, Kouta mounts the Dandeliner and launches an attack on the Yggdrasill Corporation headquarters. A team of Kurokage Troopers are dispatched to stop him, but there is little they can do to stop Armored Rider Gaim's new form, Kachidoki Arms, and are defeated by his varied attacks through the DJ Gun. Takatora appears to confront him as Zangetsu Shin, but fails to stop Gaim from destroying the Scalar System.
Gaim then flees, after declaring that with their contigency plan destroyed, the Yggdrasill Corporation has no option but to find a way to stop the Helheim Forest's invasion. The mysterious girl reprimands DJ Sagara for interfering with Kouta's decision, but he points out that she also did the same, as in the end, all that matters is who will be the one to be chosen by the Helheim Forest. Enraged with the recent developments, Ryoma contacts Mitsuzane and instructs him to investigate Kouta in order to find out who betrayed the Yggdrasill Corporation and is assisting him.
- 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), Mysterious Girl (迷の少女 Nazo no shōjo): Yuumi Shida (志田 友美 Shida Yūmi)
- Takatora Kureshima (呉島 貴虎 Kureshima Takatora): Yuki Kubota (久保田 悠来 Kubota Yūki)
- Lock Dealer Sid (錠前ディーラー シド Jōmae Dīrā Shido): Kazuki Namioka (波岡 一喜 Namioka Kazuki)
- Ryoma Sengoku (戦極 凌馬 Sengoku Ryōma): Tsunenori Aoki (青木 玄徳 Aoki Tsunenori)
- Yoko Minato (湊 耀子 Minato Yōko): Minami Tsukui (佃井 皆美 Tsukui Minami)
- DJ Sagara (DJサガラ Dī Jei Sagara): Tomomitsu Yamaguchi (山口 智充 Yamaguchi Tomomitsu)
- Kiyojiro Bando (阪東 清治郎 Bandō Kiyojirō): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Demushu (デェムシュ Dēmushu, Voice): Tomokazu Sugita (杉田 智和 Sugita Tomokazu)
- 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)
- Narration (ナレーション Narēshon): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- Lock Used:
- Orange, Dandeliner, Kachidoki
- Banana, Mango
- Kurokage Troopers:
- Zangetsu Shin:
- Melon Energy
- Arms Change:
- Lock Vehicle:
- As part of Super Hero Time, this episode aired alongside Ressha Sentai ToQger episode 6, Station 6: What Are We Looking For?.
- Viewership: 5.6%
- Closing Screen Lockseed Collection:
- This episode concludes the Helheim Saga.
- DJ Sagara refers to the mysterious girl as the "first woman".
- During that same scene, a different dialogue is used in Episode 43.
- This episode marks Kaito's first time transforming into Baron directly into another Arms, rather than transforming into his primarily used Banana Arms first. In this case, Mango Arms.
- It is also the only time Kaito transforms directly into Baron Mango Arms.
- TV Asahi's official summary for 「いざ出陣！カチドキアームズ！」
- Toei TV's official episode guide for 「いざ出陣！カチドキアームズ！」