There exist various conflicts over political, economical and religious positions in international society. A thoughtful attitude of peaceful coexistence is required for children so that they can resolve these conflicts in their own future. This attitude is based on humanitarianism and social justice. In this case, justice refers to offering a helping hand to persons who are beset by some problem or concern. The practice of social justice seems to contribute to the realization of a peaceful society in which everyone can coexist including social underdogs and minorities. In this paper, we propose a method of moral education that has been aimed at fostering an awareness of the value of social justice based on humanitarianism. Our focus is on high school students.