This article is about a/an ally in Kamen Rider Den-O.

Chiyoko Shimizu (清水 千代子 Shimizu Chiyoko): Chiyoko is Yu's maternal grandmother and his legal guardian. Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship

Chiyoko Shimizu was portrayed by Tomiko Ishii (石井 トミコ Ishii Tomiko).

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