Eyeshield 21
In Tokyo, 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 the team secretary and enter the field under the pseudonym of "Eyeshield 21" wearing a helmet with an eyeshield to hide his features.

Season 1 · Episode 57 ·
The Man Who Knows 21
When Monta and Sena are sent to spy on the Poseidons' final practice before the game, they are caught, and Kakei tells Sena that he wants to challenge Eyeshield 21 from the Devil Bats and prove to him that he will never match up to the "real" Eyeshield 21. Sena gets past him using the Devil Bat Ghost, but Hiruma, who had been watching, tells Sena that it was not Kakei's true strength he was running against.
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Episode 57 of season 1 of Eyeshield 21: “The Man Who Knows 21”. Aired 2006-05-10. Watch it online free on ZapFlix.