The former Nagasaki City Keiho Middle School was one of the schools that was merged into the current Nagasaki Prefectural Nagasaki Higashi Junior High School & Nagasaki Higashi High School and Nagasaki Prefectural Nagasaki Nishi High School, the latter of which took over the grounds of the former middle school. The former middle school was a mixed five-grade school that became a high school under the post-war school system. The characters used in the word "keiho" can also be read as "tamanoura" (literally "the jewel bay"), and the school's name was thus derived from the image of Nagasaki as a beautiful port.

As Keiho Middle School was situated 0.8km south-southwest of the hypocenter the all the structures including the main building and annex collapsed and the gymnasium and workshop were burnt down to the ground. The principal, Yogoro Kazugawa, and six other teachers were buried under the collapsed buildings and died there in the line of duty. Due to student mobilization the children in the second grade and older had been mobilized to various places and only the first graders were attending the school. On the exact day of the bombing they had an English test that finished around 10am and had gone home, so the only children remaining at the school were around 40 members of the school defense unit. It is said that the majority of these defense unit member children were killed by the atomic bomb.

There are not many relics recalling the atomic bombing left at the present-day Nagasaki Prefectural Nagasaki Nishi High School. However, this camphor tree that managed to survive the terrors of the bombing still watches over all the students.