As her parents moved around for work, she spent time in Chiba, Hiroshima and Kanagawa Prefectures before settling in Osaka for high school.
[2] In March 2011, Mitsumune won the Grand Prix at the Kobe Collection Model Audition 2011.
[6][7] She played the lead role for the first time in the film Joshi Camera, and it was released on November 24, 2012.
[8] Mitsumune made a comeback to the entertainment industry appearing in the film Gekijōban Ataru The First Love & The Last Kill released on September 14, 2013.
[9] In April 2014, it was announced that she belonged to the agency Flave Entertainment, and she resumed her activity in full swing.