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Kei Sakai (酒井 啓史, Sakai Keishi) is a Japanese animator and character designer. He belongs to Studio Kelmadick. He is credited under the names 酒井啓史 (Sakai Keishi) and 酒井啓, 酒井KEI, 酒井Kei, 酒井Key (Sakai Kei).