In Tokyo,[note 1] a weak, unassertive boy named Sena Kobayakawa enters the high school of his choice—Deimon Private Senior High School. Sena's only remarkable physical abilities are his running speed and agility, which are noted by the school's American football team captain Yoichi Hiruma. Hiruma forces Sena to join the Deimon Devil Bats football team as its running back. To protect his identity from other teams who want to recruit him, Sena is forced to publicly assume the role of team secretary and enter the field under the pseudonym of "Eyeshield 21" wearing a helmet with an eyeshield to hide his features. The makeshift team initially takes part in the spring football tournament hoping to win through the strength of their new "secret weapon". However, the extremely weak team is eliminated early by the Ojo White Knights, one of the best football teams in Japan.