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Eyeshield 21 (Japanese: アイシールド21 Hepburn: Aishīrudo Nijūichi?) is a Japanese manga series written by Riichiro Inagaki and illustrated by Yusuke Murata. The series tells the story of Sena Kobayakawa, an introverted boy who joins an American football club as a secretary, but after being coerced by Yoichi Hiruma, turns out to play wearing an eyeshield and the number 21, under the pseudonym of "Eyeshield 21".

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.

After Deimon's defeat, the spring tournament is revealed as secondary in importance to the fall tournament, where the teams compete for the chance to play in the Christmas Bowl—the high school football league championship. Hiruma, Ryokan Kurita, and Sena regroup and slowly build a real team from misfits and students looking to define themselves, such as Tarō "Monta" Raimon—a baseball player who can only catch—and the Ha-Ha Brothers. Other characters slowly join the team, and the series follows the building and growth of the Deimon Devil Bats and its members, and rival teams as they all strive to achieve their goal of playing in the Christmas Bowl.

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Information about Football
American football, referred to as football in the United States and Canada, and also known as "gridiron football" or simply "gridiron", is a sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with control of the oval-shaped football, attempts to advance down the field by running with or passing the ball, while the team without control of the ball, the defense, aims to stop their advance and take control of the ball for themselves. The offense must advance at least ten yards in four downs, or plays, or else they turn over the football to the opposing team; if they succeed, they are given a new set of four downs. Points are primarily scored by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal. The team with the most points at the end of a game wins.

A football game is played between two teams of 11 players each.[28][29][30] Playing with more on the field is punishable by a penalty.[28][31][32] Teams may substitute any number of their players between downs;[33][34][35] this "platoon" system replaced the original system, which featured limited substitution rules, and has resulted in teams utilizing specialized offensive, defensive and special teams squads.[36]

Individual players in a football game must be designated with a uniform number between 1 and 99. NFL teams are required to number their players by a league-approved numbering system, and any exceptions must be approved by the Commissioner.[28] NCAA and NFHS teams are "strongly advised" to number their offensive players according to a league-suggested numbering scheme.[37][38]

Offense
The role of the offensive unit is to advance the football down the field with the ultimate goal of scoring a touchdown.

The offensive team must line up in a legal formation before they can snap the ball. An offensive formation is considered illegal if there are more than four players in the backfield or fewer than five players numbered 50-79 on the offensive line.

Players can temporarily line up in a position whose eligibility is different from what their number permits as long as they immediately report the change to the referee, who then informs the defensive team of the change.

Neither team's players, with the exception of the snapper, are allowed to line up in or cross the neutral zone until the ball is snapped. Interior offensive linemen are not allowed to move until the snap of the ball.

The main backfield positions are the quarterback (QB), halfback/tailback (HB/TB) and fullback (FB). The quarterback is the leader of the offense. Either he or a coach calls the plays. Quarterbacks typically inform the rest of the offense of the play in the huddle before the team lines up. The quarterback lines up behind the center to take the snap and then hands the ball off, throws it or runs with it.

The primary role of the halfback, also known as the tailback, is to carry the ball on running plays. Halfbacks may also serve as receivers. Fullbacks tend to be larger than halfbacks and function primarily as blockers, but they are sometimes used as runners in short-yardage situations and are seldom used in passing situations.

The offensive line (OL) consists of several players whose primary function is to block members of the defensive line from tackling the ball carrier on running plays or sacking the quarterback on passing plays. The leader of the offensive line is the center (C), who is responsible for snapping the ball to the quarterback, blocking,[44] and for making sure that the other linemen do their jobs during the play. On either side of the center are the guards (G), while tackles (T) line up outside of the guards.

the principal receivers are the wide receivers (WR) and the tight ends (TE). Wide receivers line up on or near the line of scrimmage, split outside of the line. The main goal of the wide receiver is to catch passes thrown by the quarterback,[44] but they may also function as decoys or as blockers during running plays. Tight ends line up outside of the tackles and function both as receivers and as blockers.

Character
Let talk about the Character of Eyeshield 21 let first talk about the Main Protagonist

Sena Kobayakawa
Sena Kobayakawa is the protagonist of the Eyeshield 21 series. During his childhood, he was a shy boy who was bullied and needed to be protected by Mamori Anezaki. Seeing this, Riku Kaitani, a young friend of Sena, taught him a running technique he referred to as the "explosive run" so Sena could defend himself. However, Sena used this to become a gofer for others instead of getting rid of bullies. In his first day at Deimon High School, he is chased by three bullies known as the Ha-Ha Brothers and his speed is discovered by Hiruma. Under the alias "Eyeshield 21" because of the green eyeshield he wears to conceal his identity, Sena joins Deimon's football team.