|This article is about a/an episode in Shuriken Sentai Ninninger.|
Shinobi 21: Burn! Ninja Baseball of Dreams (燃えよ！夢の忍者野球 Moeyo! Yume no Ninja Yakyū?) is the twenty-first episode of Shuriken Sentai Ninninger. It features the debut of Ariakenokata following her revival at the end of the previous episode.
Kinji has now become an “apprentice” disciple of Yoshitaka and joins the rest of the team in ninjutsu training. Since he attained his abilities through self-schooling, he knows nothing about the basics. It is then that he decides to train from zero by himself. A young boy who had stayed for extra baseball practice sees Kinji training. Then, the dream eating Yokai, Baku, appears and attacks the boy. Takaharu appears and shields him, but both their dreams get eaten. Also, Kyuemon has broght back the last member of the Kibaoni Army, none other than Gengetsu’s wife, the Lady of Kibaoni's house, Ariakenokata!
Almost immediately after the previous episode, Kyuemon revives Ariakenokata, Kibaoni's wife. The latter however immediately throws a fit directed at Masakage due to the lack of fear and demands him to gather more, while in a different location, Youkai Baku is created from a purse, stealing the owner's dream with his Dream Eater beam.
Now that Kinji is officially his student, Yoshitaka assigns the Ninningers to learn advanced Shuriken Ninpo by the end of summer and tells them to begin with the basics. Kinji, who hasn't learned Goton techniques, heads off to work on them on his own when he finds Kaito Kita, a young boy aspiring to become a pro baseball player. However, Baku arrives and steals the dreams of Takaharu and Kaito, and both lose their interests. Fully satisfied, the Youkai begins to take a break when Ariakenokata arrives and demands him to gather children's fear.
Takaharu begins searching for a job while Kaito decides to leave when Baku returns, using Takaharu's dream to turn all of the Jukkarage with him into ninjas. They are quickly defeated, and Kinji decides to bait the Youkai into activating Kaito's dream to remind the boy of his aspirations.
Using various Nin Shuriken, the Ninningers defeat the Jukkarage and Baku in baseball while having both Takaharu and Kaito involved to remind them of their goals. Takaharu turns into AkaNinger Chouzetsu, and defeats the Youkai in a combination attack with the others.
A giant Baku uses his Dream Eater beam on Shurikenjin, taking all of the core Ninningers' dreams, when Bison King knocks them out of his body for Kaito to throw back. AkaNinger summons Lion Ha-Oh and defeats him.
- Takaharu Igasaki (伊賀崎 天晴 Igasaki Takaharu?): Shunsuke Nishikawa (西川 俊介 Nishikawa Shunsuke?)
- Yakumo Katou (加藤 八雲 Katō Yakumo?): Gaku Matsumoto (松本 岳 Matsumoto Gaku?)
- Nagi Matsuo (松尾 凪 Matsuo Nagi?): Kaito Nakamura (中村 嘉惟人 Nakamura Kaito?)
- Fuuka Igasaki (伊賀崎 風花 Igasaki Fūka?): Yuuka Yano (矢野 優花 Yano Yuka?)
- Kasumi Momochi (百地 霞 Momochi Kasumi?): Kasumi Yamaya (山谷 花純 Yamaya Kasumi?)
- Kinji Takigawa (キンジ・タキガワ?): Hideya Tawada (多和田 秀弥 Tawada Hideya?)
- Yoshitaka Igasaki (伊賀崎 好天 Igasaki Yoshitaka?): Takashi Sasano (笹野 高史 Sasano Takashi?)
- Kyuemon Izayoi (十六夜 九衛門 Izayoi Kyūemon?, Voice): Megumi Han (潘 めぐみ Han Megumi?)
- Masakage Tsugomori (晦 正影 Tsugomori Masakage?, Voice): Ryūsei Nakao (中尾 隆聖 Nakao Ryūsei?)
- Ariake no Kata (有明の方 Ariakenokata?, Voice): Kotono Mitsuishi (三石 琴乃 Mitsuishi Kotono?)
- Youkai Baku (妖怪バク Yōkai Baku?, Voice): Shinya Fukumatsu (ふくまつ 進紗 Fukumatsu Shin'ya?)
- Shishi-Oh (獅子王 Shishiō?, Voice): Yukio Yamagata (山形 ユキオ Yamagata Yukio?)
- Koji Kitabeppu (北別府 浩二 Kitabeppu Kōji?): Hiryu Fujimoto (藤本 飛龍 Fujimoto Hiryū?)
- Boy: Kaito Kita (喜多 海斗 Kita Kaitō?), Takuto Kudo (工藤 大空飛 Kudō Takuto?)
- OL: Wakana Hagiwara (荻原 和佳奈 Hagiwara Wakana?)
- AkaNinger: Kosuke Asai (浅井 宏輔 Asai Kōsuke?)
- AoNinger: Yuji Nakata (中田 裕士 Nakata Yuji?)
- KiNinger: Yasuhiro Takeuchi (竹内 康博 Takeuchi Yasuhiro?)
- ShiroNinger: Ryoko Gomi (五味 涼子 Gomi Ryōko?)
- MomoNinger: Mizuho Nogawa (野川 瑞穂 Nogawa Mizuho?)
- StarNinger: Masashi Takada (高田 将司 Takada Masashi?)
- Shinobimaru: Satoshi Fujita (藤田 慧 Fujita Satoshi?)
- Shurikenjin: Hideaki Kusaka (日下 秀昭 Kusaka Hideaki?)
- Rodeomaru: Hiroyuki Tanaka (田中 宏幸 Tanaka Hiroyuki?)
- Lion Ha-Oh: Jiro Okamoto (岡元 次郎 Okamoto Jirō?)
- Kyuemon Izayoi: Yuichi Hachisuka (蜂須賀 祐一 Hachisuka Yūichi?)
- Masakage Tsugomori: Riichi Seike (清家 利一 Seike Riichi?)
- Ariake no Kata: Satoshi Fujita (藤田 慧 Fujita Satoshi?)
- Yokai Baku: Shinsuke Kusano (草野 伸介 Kusano Shinsuke?)
- Jukkarage: Various
- AkaNinger - Goton (Wood Setting), Chozetsu (x2), Shinobimaru, Lion Ha-Ojo
- AoNinger - Goton (Wood Setting), Goton (Water Setting), Kakuranger (Cloning Technique), AoNinger (Ninja Strike), Dragomaru
- KiNinger - Goton (Wood Setting), KiNinger (Ninja Strike), Dumpmaru
- ShiroNinger - Goton (Wood Setting), Goton (Metal Setting), Surf (Surfer Catch Technique), ShiroNinger (Ninja Strike), Wanmaru
- MomoNinger - Goton (Wood Setting), Goton (Fire Setting), UFO (UFO Ball Technique), MomoNinger (Ninja Strike), Byunmaru
- StarNinger - Goton (Metal Setting), Goton (Fire Setting), StarNinger (Ninja Slash), Rodeomaru
- As part of Super Hero Time, this episode aired alongside Kamen Rider Drive episode 38, Why is the Devil Still Seeking Evolution?.
- Sealing Shuriken purified: 21 out of 48
- In Ninningers' possession: 20
- In Kyuemon's possession: 1
- Most fireworks in closing credits:
- Blue: 5
- Red: 4
- Green: 3
- Yellow: 3
- This is first time Yoshitaka directly teaches his grandchildren along with Kinji, as they were previously only taught by Tsumuji.
- This episode makes some reference to Shurikenger in that he's a baseball themed sentai ranger who made his first appearence in episode 21 of Ninpu Sentai Hurricaneger.
- Interestingly, StarNinger is the sixth hero like Shurikenger and this episode marks the first time he studies under the Last Ninja.
- The battle between Ninningers and Youkai Baku is similar to episode 53 of Himitsu Sentai Gorenger, as well as the summer movie for Kaizoku Sentai Gokaiger, both of which featured Baseball Mask as the opponent.
- Kotono Mitsuishi (Ariakenokata) makes her debut in this episode. She is better known as the voice of Usagi Tsukino/Sailor Moon in Pretty Guardian Sailor Moon Crystal.
- The opening is altered in various ways:
- Kinji is no longer labeled as the Ninningers' opponent and is added to the main team.
- Various scenes of the Summer Movie are shown.
- Bison King and StarNinger join the Ninningers and Shurikenjin at the end of the opening.
- Humorously, the number of Nin Shuriken as of this episode matches up with the episode number.