She was born in Tokyo, Japan. Her blood type is O. Mitsu Anzu is her stage name used for adult works.

She is famous in Japan as a lovely female radio actor who wore glasses. Moreover, there are a lot of women who wore glasses to the character that she performs.

Her nickname is 舞太 (Maita). The name originated from a mail address registration, where she wanted to use "mai" but wasn't allowed, so she opted for "maita" instead.

On January 21, 2007, she announced on her website that she will change her stage name from 門脇 舞 to 門脇 舞以, which has the same pronunciation but written with different kanji.

In September 2009, she was threatened by mail and a man was arrested for the act.

Twitter: @kadomaita