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The time is 1969.
Mysterious aliens known as Invaders are revealing themselves among humans,
wreaking havoc all over the world. AEGIS (Alien Extermination Global Intercept
System) is an organization dedicated to stopping the Invaders, gathering young
people with special powers to help them fulfill their objective. AEGIS' recruits
have the ability to open and close different kinds of inter-dimensional gates
that are used to fight the Invaders, thus they were called Gate Keepers.
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