Bullying is a physically and mentally painful problem involving multiple parties. Schoolchildren are still in the process of maturing and can easily become mentally and physically unbalanced. From the perspective of brain science, the frontal lobe of the human brain develops slowly and takes time to mature until adolescence, and attachment and mentalization mature through experience, but schoolchildren are still in the process of development, and appropriate experiences can help prevent bullying. In playback theater at schools, it is thought that the perspectives of the people involved in the bullying situation through storytelling and acting will cause changes in the participants' minds and attitudes as they experience the bullying through acting. As a result, it is believed that the narratives of the parties involved will cause them to reexamine their own minds and the minds of others and, through mentoring, to become aware of something in the other party and in themselves and to think about it. Narratives are not only told, but when they are acted out, a deeper understanding is brought forth. From the standpoint of brain science, we will examine the meaning of playback theater activities in anti-bullying projects.