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Kobayakawa Sena is a little guy who always gets bullied at school. Since elementary school, he always played the role of the errand boy to the extent that he has become swift and fast. Coincidentally, Hiruma Youichi and Kurita Ryukan are looking for a fast running back for their American Football team (Amefuto) and want to put Sena on the team. To hide their new star player from the eyes of other High Schools, Hiruma encases Sena in an Amefuto helmet with a dark visor and names him Eyeshield #21.
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