It is Tokyo, 1969. Earth is under the attack of the "Invaders." Fortunately, though, the public is unaware of this. But to the secret orginazation, A.E.G.I.S., the threat is very real, and it is up them to stop this invasion. One day on his route to high school, Ukiya Shun observes a battle between a young girl and a group of Invaders. He ends up helping her and discovers that much like the girl, he possesses the ability to generate a "gate" of special power that only a few other people are gifted with. As a result, Ukiya then joins A.E.G.I.S. in an effort to recruit other Gate Keepers in order to protect the city, all while doing his best not to imitate his late father, whom he dispises.
 
(Source: Anime News Network)

32 years have passed since the initial defeat of the Invaders. A.E.G.I.S is all but dismantled now and has become an underground organiziation consisting of only a few Gate Keepers left to save humanity. One of the members, Ayane Isuzu, is sick of society as a whole, though she continues to defeat the Invaders out of spite for her father. Suddenly, she learns of the revival of Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl now accompanies them. It is up to Ayane and the remnants of A.E.G.I.S to stop them and save humanity once again.
 
(Source: Anime News Network)

After attacked by an alien, saved by a girl, and discovers he has extraordinary powers, Shun Ukiya has had a hell of first day of school. Realizing what this new power is all about soon becomes one of the less important things that threaten Earth. 
 
(Source: Anime News Network)

The year is 1963 and the earth is in danger; Invaders are plotting to infiltrate Earth and wreaking havoc when they appear. Normal weapons have no effect. 
Mankind's only hope are the "Gate Keepers", human beings with the ability to wield incredible psychic powers. 
Shun Ukiya is one such Gate Keeper. He was leading a normal high school life, but those days are over - If the Earth is going to stand a chance he, and other Gate Keepers just like him, are going to need to band together and fight.

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