Takashi never graduated from elementary school because of not eating green peppers. He is already 20 years old and his fellow classmate Megumi is a new teacher at his school. See how this story unfolds in a comedic way.

学級目標「給食を残さない」を達成できず11年の時が過ぎ、小学生のまま20歳になった望月タカシ（小４）。そんなタカシのクラスにかつての同級生で、タカシが初恋の相手である朝日奈めぐみ（20歳）が担任教師としてやって来た！
Failing to complete the class goal 'Leave no food behind!' for 11 years straight, Mochizuki Takashi (4th grade) has turned 20 stuck as an elementary schooler. Then, an old classmate of his returns to his current class, Asahina Megumi (20), who loved Takashi, as none other than his homeroom teacher!