|This article is about a/an episode in Shuriken Sentai Ninninger.|
Shinobi 23: It's Summer! Ninja Courage Test (夏だ！忍者キモだめし Natsu da! Ninja Kimodameshi) is the twenty-third episode of Shuriken Sentai Ninninger.
Nagi, wanting to see Kasumi be bad at something for once, organizes a Ninja guts challenge. He will have Fuuka and Kasumi enter a building said to be haunted and the boys will disguise themselves to scare them. However, Yokai Yuki-Onna appears and the other Rangers are frozen, leaving Nagi by himself. Knowing that this time it is up to him alone, he decides to confront Yuki-Onna.
During a hot summer day, Kasumi manages to combine the Water and Metal techniques of the Goton Nin Shuriken to perform an Advanced Shuriken Ninpo, creating an illusion of Antarctica to make Takaharu think it's extremely cold. She states that she'd been practicing from time to time but can't control it properly. Amazed, Nagi asks her to teach him how to do it once she figures it out, but the latter tells him that he shouldn't continue to rely on others or he'll never grow up.
Ariakenokata returns to gather fear, but ends up retreating as Kasumi uses a water technique to direct ultraviolet rays at her. The other Ninningers compliment her, but Kasumi secretly tells Fuuka of her fear- ghosts, which Nagi overhears. He tells the other boys, who agree, all except Yakumo, until Nagi says he's scared of her.
Unfortunately, one of Ariakenokata's Jukkarage overhear this, and she gives Kyuemon a Sealing Shuriken. Dressing up as a ghost, zombie, fallen soldier and a red pepper, the guys successfully pull their prank, only to find that Kasumi is missing and Fuuka noticed a "lady ghost". Concerned, Takaharu runs in, but after a while still doesn't come out. Yakumo and Kinji enter as well, but after a while, Fuuka and Nagi hear their screams and go to check.
They find everyone in a room, frozen, and find the Snow Woman Youkai, Yuki-Onna, has done this. Although they attempt to battle the Youkai, they are easily beaten and Fuuka is frozen. Knowing he's the only one left and he can't rely on others, Nagi successfully pulls off an Advanced Shuriken Ninpo technique with Fire and Earth, but slips and cuts the illusion short. Kasumi then suddenly appears, revealing she had used the Kakuranger Shuriken to duplicate herself. She also mentions that her fear of ghosts was made up after hearing Ariakenokata saying she'd experience fear that'd make her hair stand up on her end, and that Nagi had helped by pulling this prank.
Using a double-Fire technique, the two manage to free everyone (as well as causing the boys' costumes, not to mention Yuki-Onna, to catch on fire), and they once again come together to defeat the horde of Jukkarage. Nagi then uses a Triple Combination to distract Yuki-Onna before finishing her with Takaharu and Kasumi.
An enlarged Yuki-Onna proceeds to freeze Shurikenjin Drago, Bison King and Lion Ha-Oh into a snowman, but Nagi allows this to create "Ha-Oh Shurikenjin the Snowman". Crashing into the Youkai, the tank-robot breaks out and obliterates her.
Irritated that Japanese Youkai are useless, Ariakenokata calls upon three European monsters. Meanwhile, Kasumi reveals she is actually fascinated of ghosts due to a lack of rational explanation to their existence.
- 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)
- Tsumuji Igasaki (伊賀崎 旋風 Igasaki Tsumuji): Toshihiro Yashiba (矢柴 俊博 Yashiba Toshihiro)
- Kyuemon Izayoi (十六夜 九衛門 Izayoi Kyūemon, Voice): Megumi Han (潘 めぐみ Han Megumi)
- Ariake no Kata (有明の方 Ariakenokata, Voice): Kotono Mitsuishi (三石 琴乃 Mitsuishi Kotono)
- Yokai Yuki-Onna (妖怪ユキオンナ Yōkai Yuki Onna, Voice): Kimiko Saitō (斉藤 貴美子 Saitō Kimiko)
- 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)
- Ariake no Kata: Satoshi Fujita (藤田 慧 Fujita Satoshi)
- Yokai Yuki-Onna: Jiro Uchikawa (内川 仁朗 Uchikawa Jirō)
- Jukkarage: Various
- AkaNinger - Chozetsu, Lion Ha-Ojo, Shinobimaru, Super Combination (Ha-Oh Shurikenjin)
- AoNinger - Dragomaru
- KiNinger - Goton (Fire Setting), Goton (Fire + Earth Settings), Goton (Fire + Metal + Wood Settings), KiNinger (Ninja Flash), Dumpmaru
- ShiroNinger - Wanmaru
- MomoNinger - Goton (Water + Metal Settings), Goton (Water Setting), Goton (Fire Setting), MomoNinger (Ninja Flash), Byunmaru
- StarNinger - Rodeomaru
- to be added
- As part of Super Hero Time, this episode aired alongside Kamen Rider Drive episode 40, Why Are the Two Scientists Having a Conflict?.
- Sealing Shuriken purified: 23 out of 48
- In Ninningers' possession: 22
- In Kyuemon's possession: 1
- Most fireworks in closing credits:
- Blue: 4
- Red: 3
- Green: 6
- Yellow: 3
- This episode marks the first time two Ninningers (Kasumi and Nagi) use mixed elements with the Goton Nin Shuriken.
- Last appearance of Shurikenjin Drago.
- First appearance of Western Yokai during the closing scene.
- During the ending dance sequence, the Dinosaur Lord and his ninja army join the dance and the dances are shot on location where the Ninninger summer movie was filmed. This was made to promote the Ninninger movie, which would be released in Japanese theaters by the time the next episode aired.
- At the end of the episode, Kasumi states that she actually finds ghosts fascinating. Ironically, at the time this episode aired, details about Kamen Rider Ghost were surfacing online and at Toei.
- Some fans also see this as a missed opportunity for a setup to a crossover gag or joke, as when Ghost airs for the next Sentai team up, Ninninger will have ended its run on the air and be replaced by its successor.
Shuriken Sentai Ninninger Volume 6 features episodes 21-24: Shinobi 21: Burn! Ninja Baseball of Dreams, Shinobi 22: Super Combination! Ha-Oh Shurikenjin, Shinobi 23: It's Summer! Ninja Courage Test and Shinobi 24: It's Summer! The Chilling Arrival of Western Yokai!
Blu-ray Collection 2 comes with 12 episodes.