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

The Battle Spirits Warring States Era is on rise. The Institution for Battle Spirits Administration (IBSA) has at least created a virtual system for spirits to battle in 3D. Thanks to this, the popularity of Battle Spirits has erupted all over the nation. All over, rivalries like that of local warlords have broken out between champion battlers. The battlers have but one objective, reach the top in Battle Spirits... Therefore unifying the nation. Now, the unification of this world will be risked with Battle Spirits... In this story of heated battlers... Who charge through this world of war.

This show revolves around the three Fortress Knights and a human boy named Jung who are about to shape the Fortress Planet, known as the home where robots live in peace. But the harmony was disrupted because of the sudden presence of a dictator Dark Fortress along with his evil schemes. Now it's up to the Fortriss Knights and Jung, who accidentally got into the Fortriss Planet, to battle the evil forces maintain peace throughout the Fortress Planet.