A global perspective has become indispensable in Japanese education. As the Ministry of Education, Culture, Sports, Science and Technology’s (MEXT) most recent Courses of Study states in its preamble and general provisions, students should be “creators of a sustainable society.” MEXT’s required Period for Inquiry-based Cross Disciplinary Study and similar courses, along with various educational practices and research, have been implemented to nurture students’ global perspectives. However, most of these efforts target the whole school or are practices designed to create positive impacts over the long term. Few studies capture changes in students’ awareness through short-term practices. In this study, short-term global education lessons were conducted involving 110 first- through third-year high school students. A questionnaire was used to analyze changes in students’ attitudes and dispositions toward a variety of cultures, and the significance of short-term global education lessons was examined. The results suggested that students’ international disposition was higher after the practice than before.