She is a descendant of Arimura Tsugizaemon, the ringleader of the Sakuradamon Incident, and Togo Heihachiro, the admiral of the Russo-Japanese War.

Arimura's views on comfort women, military prostitutes during World War II, have been criticized.

Her uncle, Kunitaka Arimura (有村 國孝) is the inventor of Integrated Circuit Card.

in social science from International Christian University (ICU) in Mitaka, Tokyo and received a M.A.

Having been elected to the House of Councillors, Arimura stopped the Ph.D. in international business programme at Aoyama Gakuin University.