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Teppei, brought up by his father in the mountains, is an energetic boy who is as tough as weeds and acts as free as a bird. His life changes completely when he enrolls in high school, the first school he has ever attended. Despite his eccentric behavior and being a constant source of troubles, he is soon recognized for his talent in sports-especially in Kendo (the Japanese swordplay art) - and becomes the school’s hero.