|This article is about a/an episode in Kamen Rider OOO.|
The Big Sister, the Doctor, and the Truth about Ankh (姉と博士（ドクター）とアンクの真実 Ane to Dokutā to Anku no Shinjitsu) is the twenty-ninth episode of Kamen Rider OOO.
Eiji investigates the truth regarding who Ankh is, while Kazari decides to create a Yummy from Maki's desire to see what he's really made of.
Finding Ankh is out searching for whoever has his Core Medals, Eiji realizes there is another reason why the Greeed could not fully regenerate. At the Kougami Foundation, his partnership to Kazari found out and Maki is threatened with swift and brutal consequences if he continues helping the Greeed. Later, visiting the grave of his sister, Hitomi, where he calls Kazari to meet him, Maki tells him to absorb the other Core Medals and evolve into a Mega Greeed to achieve his desire. However, not intending to lose his mind, Kazari creates a Yummy from Maki, much to the doctor's shock. The Yummy acts on Maki's true desire and crushes Hitomi's grave out of obsession before walking away. Though ordered to call the Yummy off, Kazari refuses Maki's request as he intends to learn what is going on with Ankh. Finding Ankh, Eiji brings him food to nourish Shingo's body. By then, with Maki disgusted that his desire is not one of doomsday, he watches the White Yummy bear-hug the life out of people before turning into the Shachi-Panda Yummy. Alarmed to the Yummy's presence while training, Kamen Rider Birth fights the Shachi-Panda Yummy before the monster eludes him. Following Chiyoko without her knowledge, the Shachi-Panda Yummy is stopped by Maki as he uses the Ptera Candroids to drive the monster off. But it only enrages the monster as Kamen Rider Birth arrives and fights the Yummy before it escapes him again. Maki ends up being looked after by Hina and Chiyoko as the memories of his sister's death flood his mind from being in the latter's presence. On their way to the Cous Coussier, Ankh senses his Core Medals as he and Eiji find Kazari waiting for them, interested in what will happen. Eiji demands to know what Ankh is hiding from him to which Kazari agrees to reveal after taking back his Core Medal by force. Eiji becomes Kamen Rider OOO Tajadol Combo to fight Kazari before their fight is interrupted by a being that Kazari calls "Ankh". "Ankh" proceeds fight Kamen Rider OOO with Ankh telling the Kamen Rider to destroy the Greeed. Though the two are equal in power, Eiji's body can no longer handle the strain and he cancels the transformation before "Ankh" sees Ankh and attempts to absorb him, with Eiji trying to stop it.
Core Medals and Combos
- Core Medals Used:
- Head - Taka
- Arms - Kujaku
- Legs - Condor
- Combos Used:
- Tajadol Combo
- Eiji Hino (火野 映司 Hino Eiji): Shu Watanabe (渡部 秀 Watanabe Shū)
- Ankh/Shingo Izumi (アンク／泉 信吾 Anku/Izumi Shingo): Ryosuke Miura (三浦 涼介 Miura Ryōsuke)
- Hina Izumi (泉 比奈 Izumi Hina): Riho Takada (高田 里穂 Takada Riho)
- Shintaro Goto (後藤 慎太郎 Gotō Shintarō): Asaya Kimijima (君嶋 麻耶 Kimijima Asaya)
- Erika Satonaka (里中 エリカ Satonaka Erika): Mayuko Arisue (有末 麻祐子 Arisue Mayuko)
- Chiyoko Shiraishi (白石 千世子 Shiraishi Chiyoko)/Hitomi Maki (Maki Hitomi): Marie Kai (甲斐 まり恵 Kai Marie)
- Kousei Kougami (鴻上 光生 Kōgami Kōsei): Takashi Ukaji (宇梶 剛士 Ukaji Takashi)
- Kiyoto Maki (真木 清人 Maki Kiyoto): Yu Kamio (神尾 佑 Kamio Yū)
- Akira Date (伊達 明 Date Akira): Hiroaki Iwanaga (岩永 洋昭 Iwanaga Hiroaki)
- Kazari (カザリ): Taito Hashimoto (橋本 汰斗 Hashimoto Taito)
- Ankh (Lost) (アンク（ロスト） Anku (Rosuto), Voice): Miyu Irino (入野 自由 Irino Miyu)
- Kiyoto Maki (Child): Hayato Watanabe (渡辺 隼斗 Watanabe Hayato)
- Woman: Kiyomi Kumashiro (神代 清美 Kumashiro Kiyomi), Miwa Hashiguchi (橋口 未和 Hashiguchi Miwa)
- As part of Super Hero Time, this episode aired alongside Kaizoku Sentai Gokaiger episode 8, Little Spy Tactics.
- OOO's Core Medal Collection
- First appearance of Ankh (Lost).
Kamen Rider OOO Volume 8 features episodes 29-32: The Big Sister, the Doctor, and the Truth about Ankh, The King, the Panda, and the Flames of the Memory, Gratitude, Scheming, and the Purple Medal and The New Greeed, Emptiness, and the Invincible Combo.