It is a story of unrelenting efforts of the Ultra Guard, that defends Earth from alien invaders, and Ultraseven, a hero that helps human hand in hand with the Ultra Guard to fight.
The story revolves around the confrontation between alien intelligent life forms which come to Earth with a clear intent to invade and the Terrestrial Defense Forces (TDF) which has been established to defend Earth from these menaces, in the midst of the "Age of Interstellar Wars" that is taking place among many stars in space as its background.