She established the AAR s mine clearance project in Cambodia in cooperation with the British-based HALO Trust. She organized and chaired the NGO Tokyo Conference on anti-personnel Landmines in 1997 and twice in 1998. A strong believer in the principles of global citizenship, she has visited more than 20 countries and regions since 1991 in her quest to help those living in poverty and fear. Osa focuses on humanitarian issues from a global perspective, allowing aid recipients to obtain maximum benefit from the assistance provided. As Deputy Secretary General of the Association to Aid Refugees, Osa has also aimed at making the Japanese public aware of the rescue work.
Most Japanese people are unaware of the difficulties faced in other countries.
She intends to maintain a politically and ideologically neutral stance to allow as many interested people as possible to participate in the challenges offered by the programs. As a member of the working group of Victim Assistance of ICBL, she made a presentation at the Standing Committee of Experts on Victim Assistance, Socio-Economic Reintegration and Mine Awareness of the Mine Ban Treaty in Geneva. Osa is now responsible for the work toward a total ban of anti-personnel landmines and is Chairperson of the Organizing Committee of the Tokyo Landmines Committee, a nonprofit organization. Osa has dedicated her life to help others. She feels that to improve our global society, we must cease to ignore problems.