The work is set in the international metropolis of Shanghai, China, and uses the study and life trajectory of Hikaru Higashiyama, a Chinese-Japanese mixed-race child, as a clue. It chooses the year when the protagonist was in fifth grade, from the establishment of a new class to the time when he had to wave goodbye. The protagonist's academic performance and eyesight dropped sharply due to staying at home and taking online classes a year ago. After returning to normal school life, he caught up and became the child with the fastest progress in the class.
Purpose: In fact, children have their own answers about life, ideals and education.