Katsumura started stage activities at a local in Tokyo after graduating as a junior in high school.
On January 17, 2006, Katsumura married actor Yūsuke Tomoi; the same year on August 7, she gave birth to a girl.
She had a maternity leave after her marriage announcement on March 31, 2007; she quit her agency Versatile Entertainment to focus on her child care.
In May 2007, Katsumura started her own blog, not only to reflect on her daughter but also to show her willingness to her entertainment activities.
In October 2008, she resumed performing acting activities while belonging to her new agency, Asterisk.