Minako Kotobuki (寿 美菜子), born September 17, 1991) is a Japanese actress, voice actress and singer. She is best known for her role as Tsumugi Kotobuki in the anime series about a high school girl band K-On, and Rikka Hishikawa / Cure Diamond in Dokidoki! Precure (the 8th Pretty Cure series.) K-On! launched her music career as she performed the opening and ending themes and joined the three other voice actresses as the music group.

She is the Japanese voice of Kayo.

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