|This article is about a/an episode in Mashin Sentai Kiramager.|
Juru Atsuta, who was chosen to be the fifth Kiramager, is put in uniform and taken by Mabushina to CARAT headquarters for the first time. He is greeted by the other four members and Mr. Hakataminami, who all congratulate him by saying "Let's work well together, leader!" Huh? What?! Did they just call him their leader? In Crystalia, there is apparently a rule that states whoever is chosen by the Red Kiramai Stone will become the leader of the Kiramagers. It's not like he could say no, but just then the enemy initiates yet another sudden attack. Yodonheim's invasion apparently waits for no one. A strange monster with the head of a rugby ball has destroyed a section of the Kiramager's own city, claiming that a "Rugby Match of Hell" was about to begin. As the Kiramagers start to charge into battle, Juru tries to act like a leader.
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- Juru Atsuta (熱田 充瑠 Atsuta Jūru): Rio Komiya (小宮 璃央 Komiya Rio)
- Tametomo Imizu (射水 為朝 Imizu Tametomo): Rui Kihara (木原 瑠生 Kihara Rui)
- Sena Hayami (速見 瀬奈 Hayami Sena): Yume Shinjo (新庄 由芽 Shinjō Yume)
- Shiguru Oshikiri (押切 時雨 Oshikiri Shiguru): Atom Mizuishi (水石 亜飛夢 Mizuishi Atomu)
- Sayo Oharu (大治 小夜 Ōharu Sayo): Mio Kudo (工藤 美桜 Kudō Mio)
- Muryou Hakataminami (博多南 無鈴 Hakataminami Muryō): Daimaou Kosaka (古坂大魔王 Kosaka Daimaō)
- Princess Mabushina (マブシーナ姫 Mabushīna-hime, Voice): Inori Minase (水瀬 いのり Minase Inori)
- Mashin Fire (魔進ファイヤ Mashin Faiya, Voice): Kenichi Suzumura (鈴村 健一 Suzumura Ken'ichi)
- Mashin Shovellow (魔進ショベロー Mashin Shoberō, Voice): Mitsuo Iwata (岩田 光央 Iwata Mitsuo)
- Mashin Mach (魔進マッハ Mashin Mahha, Voice): Kenji Akabane (赤羽根 健治 Akabane Kenji)
- Mashin Jetter (魔進ジェッタ Mashin Jetta, Voice): Genki Okawa (大河 元気 Ōkawa Genki)
- Mashin Helico (魔進ヘリコ Mashin Heriko, Voice): Yuki Nagaku (長久 友紀 Nagaku Yuki)
- Demonic General of Betrayal Galza (裏切りの鬼将軍ガルザ Uragiri no Oni-Shōgun Garuza, Voice): Yuuichi Nakamura (中村 悠一 Nakamura Yūichi)
- Mask of Darkness Carantula (闇の仮面遣いクランチュラ Yami no Kamen Tsukai Kuranchura, Voice): Yasuhiro Takato (高戸 靖広 Takato Yasuhiro)
- Narration: Tomokazu Sugita (杉田 智和 Sugita Tomokazu)
- Kiramai Red: Shigeki Ito (伊藤茂騎 Itō Shigeki)
- Kiramai Yellow: Masato Tsutamune (蔦宗 正人 Tsutamune Masato)
- Kiramai Green: Ryoko Gomi (五味 涼子 Gomi Ryōko)
- Kiramai Blue: Yasuhiro Takeuchi (竹内 康博 Takeuchi Yasuhiro)
- Kiramai Pink: Ayumi Shimozono (下園 愛弓 Shimozono Ayumi)
- Mashin Gattai Land Mage: Yohei Fujita (藤田 洋平 Fujita Yōhei)
- Princess Mabushina: Mizuho Nogawa (野川 瑞穂 Nogawa Mizuho)
- Demonic General of Betrayal Galza: Keizo Yabe (矢部 敬三 Yabe Keizō)
- Mask of Darkness Carantula: Naoko Kamio (神尾 直子 Kamio Naoko)
- Rugby Jamen: Hirotsugu Mori (森 博嗣 Mori Hirotsugu)
- Rugger Ligany: Shinsuke Kusano (草野 伸介 Kusano Shinsuke)
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- Viewership: 3.1%
- As part of Super Hero Time, this episode aired alongside Kamen Rider Zero-One episode 27, I Will Not Give Up These Lives. Super Hero Time opened up with a disclaimer for the younger viewers in regards to the current outbreak happening in the world. 
- Special unreleased cuts of this episode aired on May 24, 2020, as part of Ep. 1.2 Unreleased Cut, Warehouse Release, Start Dash Once Again SP alongside Kamen Rider Zero-One President Special PART.02.
- Pre-Credits Scene: Muryou announces a rugby pitch between Sky Mage and Land Mage. The Mashin are none too pleased but Muryou hilariously pushes them away with the rugby ball he holds.
- This episode reveals the name of the show's main villain and Yodonheim's overlord; Emperor Yodon.
- Yodon's apparent silhouette appears in the opening.
- At one point, Princess Mabushina can be seen reading a manga series titled Good Three (グッドスリー Guddosurī), written by Shiho Ichinose. The characters on the covers highly resemble the Lupinrangers. This manga also appeared in the Kishiryu Sentai Ryusoulger VS Lupinranger VS Patranger.
- Coincidentally, Sena's surname also shares the same phonetic spelling as that of Umika.
- This episode title is based on both Never Give Up (野性の証明 Yasei no shōmei) and Proof of the Man (人間の証明 Ningen no Shōmei) that were directed by Junya Sato and produced by Haruki Kadokawa.
- The jersey that Muryou wore resembles the away game jersey of the Pittsburgh Steelers.
- This episode marks the debut of the Ligany Type Jamen Beasts.
- TV Asahi's official preview for リーダーの証明
- Toei TV's official episode guide for リーダーの証明
- JAE's official episode guide for リーダーの証明