[1][2] Mochizuki left the Tokyo Municipal Oshioka Girls' High School prematurely in 1930 and gave her stage debut the same year with Ken'ichi Enomoto's Casino Folies in Asakusa.

[2] She continued with engagements such as the Shinjuku Moulin Rouge and the Shinsei Shinpa, first with light comedies, later with dramatic roles, before signing with the Shochiku film studio in 1950.

[2] Other notable appearances include Naruse's Late Chrysanthemums, Imai's The Rice People and Satsuo Yamamoto's Ballad of the Cart.

[4] In 1960, Mochizuki directed the children's short film 海を渡る友情 (Umiwowataru yūjō, lit.

[1] In 1971 and 1977, Mochizuki ran for the House of Councilors election for the Japan Socialist Party.