Eyeshield 21 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 quarterback Yoichi Hiruma, becomes the team's running back, wearing jersey number 21 and an eyeshield to conceal his identity. Inagaki chose American football as a central subject of Eyeshield 21 after realizing that it fit perfectly with his idea for the series.

Weekly Shōnen Jump is a weekly shōnen manga anthology published in Japan by Shueisha under the Jump line of magazines. The manga series within the magazine consist of many action scenes and a fair amount of comedy. Chapters of the series that run in Weekly Shōnen Jump are collected and published in tankōbon volumes under the Jump Comics imprint every two to three months. It is one of the longest-running manga magazines, with the first issue being released with a cover date of August 1, 1968.