Shin'ichi Sakurai is married to Kanako and they have a daughter named Kaori. Both, Shinichi and Kanako received only a middle-school-level education. Even though they don't have much money, they are a happy family. At work, though, Shin'ichi experiences effects of only having a middle school education.
One day, Shin'ichi sees Kaori’s poor score for a national test. He freaks out and decides to improve Kaori's education. Thus, 41-year-old Shin'ichi begins studying with Kaori and instructs her for the upcoming middle school entrance exam.