 This article is about an event in Shuriken Sentai Ninninger.
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- "Hyakki-Hyakki-Hyakki Yakou! It may be day, but we won't flinch! Let's go! Hyakki Yakou!"
- ―Hyakki Yakou roll call performed by 100 revived Yokai.[src]
Hyakki Yagyou/Yakki Yakou (百鬼夜行 Hyakki Yagyō/Yakki Yakō) is a concept in Japanese folklore which is given a modern envisioning in Shuriken Sentai Ninninger: Aka Ninger vs. Star Ninger Hundred Nin Battle!.
Overview[]
- "Long ago, during the Heian Age. In the summer, when the Yokai become more active. The legend says 100 types of monsters would rampage on a dark night. Even Yokai that had gone to Hell would revive. They would wreck and pillage the town, leaving nothing left. In other words... it's a Yokai Party Night."
- ―Hyakki Yakō as described by Kinji Takigawa[src]
Ninninger[]
The Hyakki Yakou phenomenon, as encountered by Aka Ninger and Star Ninger, saw the appearance of 100 revived Yokai in the middle of the day as opposed to at night, with Kinji theorizing that Gengetsu Kibaoni's seal being removed caused the Yokai to appear regardless of whether it's night or day. Faced with an army of a hundred Yokai, Aka Ninger and Star Ninger decided to make a contest of which of the two Ninningers could destroy the most Yokai.
- Yokai Kamaitachi: Destroyed by Star Ninger.
- Youkai Kappa: Destroyed by Aka Ninger and Star Ninger.
- Youkai Tsuchigumo: Destroyed by Aka Ninger and Star Ninger.
- 58 Jyukkarage: 32 destroyed by Star Ninger, 24 destroyed by Aka Ninger.
- 24 Dorodoros: Destroyed by Aka Ninger using Secret Sword Kakuremaru.
- 15 Genin Magerappa: Destroyed by Star Ninger using Shuriken's Bat.
With Aka Ninger and Star Ninger having defeated 50 Yokai each, the two Ninningers were left at a draw until the appearance of a Giant Yokai Gashadokuro. Using the Koromogae Shuriken to transform into incredibly powerful 'Clothes Change' forms, Aka Ninger and Star Ninger both faced the Gashadokuro without the support of their OtomoNin, determined to make it their 51st. Using their Clothes Change Shuriken, the two Ninningers end up destroying the Gashadokuro together with the combined power of the finisher attacks, leaving them arguing as to who dealt the final blow. 
TV STORY-Shuriken Sentai Ninninger: Aka Ninger vs. Star Ninger Hundred Nin Battle!
