|This article is about a/an character in Kamen Rider OOO.|
|Series:||Kamen Rider OOO|
|Ally Type:||Owner of the Cous Coussier|
|First Appearance:||Desire, Ice Pops, and Presents|
|Last Appearance:||Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max|
Chiyoko is kind and cheerful, while a little troublesome as well. She enjoys cosplaying as a method to bring more customers to her restaurant.
Part in Story
She hires Hina due to her having superhuman strength to lift things around the restaurant, and later Eiji, due to him being a world traveler. She also allows Ankh to stay at the restaurant after Eiji told her that he is a foreigner with a horrible childhood. Later, she also hires Shintaro Goto as a waiter. Chiyoko is initially the only recurring character to be unaware of the full scope of the Greeed situation, with Hina and Eiji going to lengths to prevent her from learning of Ankh's true nature and OOO.
However, after considering the seriousness of the situation when Eiji fully transforms into a Greeed and Ankh is nearly destroyed, Hina decides to reveal everything to Chiyoko. Furthermore, Chiyoko strongly resembles Dr. Maki's deceased sister and caused the doctor great stress when he meets her for the first time before her kindness strengthens his resolve to destroy everything.
Prior to the final battle, Chiyoko ends up being Kiyo-chan's new owner.
|Kamen Rider OOO|
|Eiji Hino - Akira Date - Shintaro Goto|
|Kougami Foundation and Allies|
|Kougami Foundation: Kousei Kougami - Erika Satonaka|
|Cous Coussier: Hina Izumi - Chiyoko Shiraishi - Shingo Izumi|
|Greeed: Kiyoto Maki - Uva - Kazari - Gamel - Mezool - Ankh (Lost)|
|Yummy: Waste Yummies - White Yummy - Kamakiri Yummy - Otoshibumi Yummy - Neko Yummy - Piranha Yummy - Bison Yummy - Same Yummy - Ageha Yummy - Siam-Neko Yummy - Rikugame Yummy - Kabuto Yummy - Kuwagata Yummy - Lion-Kurage Yummy - Batta Yummy - Ei-Sai Yummy - Omu Yummy - Ika-Jaguar Yummy - Shachi-Panda Yummy - Kuro Ageha Yummy - Pteranodon Yummy - Fukurō Yummy - Unicorn Yummy - Uni-Armadillo Yummy - Shamo Yummy - Ankylosaurus Yummy - Hagetaka Yummy - Nue Yummy|
|Other Characters: Gara - Kamen Rider Fourze - Kamen Rider Double - Kamen Rider Wizard - Kamen Rider Aqua - Kamen Rider Poseidon|
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