 Muranaka is part-time lecturer at the Japan Kyoto University School of Medicine.As of 2019, she lives in Germany.In 2016, Muranaka wrote in the "Wedge" magazine about research done by Shinshu University neurologist Shuichi Ikeda, alleging that some results to demonstrate a link between an HPV vaccine and brain cancer in mouse had been fabricated, resulting in a slander lawsuit.