 This article is about an actor in Kamen Rider Decade.
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Mio Arai (新井 美生, Arai Mio), better known under her current stage name Miu Arai (あらい 美生, Arai Miu), and previously Moe Arai (荒井 萌, Arai Moe), is a Japanese actress and model who portrayed Sayo Kadoya in Kamen Rider Decade: All Riders vs. Dai-Shocker.