Aiko (Risa Junna), a smart and capable urban white-collar worker, met Masaya (Genki Ohkawa), a high school student 20 years younger than her. The two of them actually collided with the spark of love. After many hardships and tests, Aiko and Masaya finally walked into the wedding hall hand in hand and began a happy and sweet married life. However, after a few days of such a good life, bad luck came. Aiko's job changed, and she was transferred to a high school to become the principal. Coincidentally, Masaya was a student in this high school. In this way, Aiko became Masaya's teacher, which means that their relationship must be kept secret from others. The bad thing is that Masaya is also a person who is very bad at lying. How long can their secret be concealed?