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 Chiyo-chan, is a child prodigy, having skipped five grades to 10th grade (first year in Japanese high school) at the start of the series, yet she is still top of the class. Such grade-skipping would be unthinkable in Japan, and the series humorously explores its potential consequences. The other characters find Chiyo amazingly cute, but sometimes take advantage of both her youthfulness and her scholastic abilities. Her diminutive stature leads to her having a lack of confidence, particularly in sports where she fears she is a burden to others.

Source from Wikipeida