When a U.S. drone strike killed her grandmother in a tribal region of Pakistan in October 2012, everything went dark, Nabila Rehman recalls. She was only 8 at the time but the memory still haunts her today.

On a recent trip to Japan, Nabila had a message to convey about the importance of creating an environment for education in her country and not war. She wants the drone strikes to stop.

"The drone attack was so dreadful that I cannot forget it even today," said Nabila, 12, at a recent symposium organized by the Center for Contemporary Islamic Studies in Tokyo. "The attack destroyed my time for school and play." She is currently not attending school.