Also known as: 黒川千秋
An iDOLM@STER Cinderella Girls character in the Cool (Blue Diamond) category. Chiaki is a very serious and mature young woman. In her initial cards she acts very aloof and serious, but starts being a bit more cheerful after meeting Manaka Misato in the Pajama Party event. Chiaki comments that Misato cheerfulness managed to move her, and the two wound up being friends. She is a good swimmer.