It is 1963, and Earth faces danger. Invaders are plotting to infiltrate the planet and wreaking havoc upon their arrival. Conventional weapons prove ineffective. Humanity's sole hope lies with the "Gate Keepers," individuals possessing the ability to wield immense psychic powers. Shun Ukiya is one such Gate Keeper. He was living an ordinary high school life, but those days are now over. If Earth is to have any chance of survival, he and other Gate Keepers like him must unite and fight.