Due to feeling unwell and unable to go to work, the boy instead went to his middle school when he experienced the atomic bomb. While the boy somehow survived, his classmates who went to the building demolishing work 600 meters away from the hypocenter all died due to the bombing. The author still suffers from survivor’s guilt and the trauma of the day 79 years ago in which his peaceful daily lives were lost. The book depicts how the author survived the day of August 6th, 1945 in the perspective of his 13-year-old self, as the uncomplicated art filled with kindness asks the readers’ emotions to understand the importance of ordinary lives without the presence of war and nuclear weapons.