A Yokohama charity worker who has spent time in Ebola-hit West Africa has urged more global support to protect orphaned children at risk of abuse.

Risa Kojima worked in Liberia to protect children in the aftermath of the Ebola epidemic that killed more than 4,000 people in the country from 2014 to earlier this year.

"Support for children is most needed after the end of the outbreak," the 32-year-old said in Tokyo after finishing her three-month mission in January as a member of Save the Children, an international nongovernmental organization, in the West African nation.