Chiaki Mayumura is a Japanese idol singer and songwriter currently associated with Toy's Factory. She has released 13 albums, with her four latest ones Gisshiri Haguki, Mejameja Monja, Gekidan Ogyarizumu and Nippon Genki Onna Kashu charting on Oricon's Top 100. She calls herself a “track maker idol with playing guitar”. She is also the president of Kaishaja Naimon Co., Ltd (Not Company[a]). Fans call her Chi-chan.
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