Insect Elimination Spray

A new school year at a certain school. A certain classroom was quietly buzzing with excitement. An incredibly impressive young lady had come from another school under the guise of a student exchange program. One self-important guy took notice of her. He was a man who was determined to make her his, surprisingly diligent about writing, and had a hobby of keeping a diary. ※There are elements related to the ending that cannot be written in the keywords (tags)! Please understand and enjoy.