(Note: Move the mouse over the text below to open the summaries of each Season, OVA, or Movie that is listed.)
~§~ Gatekeepers ~§~
In the year of 1969, Tokyo at his time Tokyo is experiencing an attack from what they are called the “Invaders.” At this time the public isn’t aware of the invasion, but a secret organization of peace-keepers called the Alien Exterminating Global Intercept System (A.E.G.I.S.), is here to stop the invasion before it gets worse. One day while walking to school, Shun Ukiya, witnesses a battle between a girl and a group of Invaders and ends up helping the girl and at that time he discovers he and the girl are the same, processing the ability to generate a “gate” of a special power that only so very few have as a gift. Shun joins A.E.G.I.S. and helps recruit other Gate Keepers in order to help protect the city from the Invaders.
~§~ Gatekeepers 21 ~§~
It’s been thirty-one years since the Invaders had been defeated. A.E.G.I.S. is all now left with only a few Gate Keeper members in its group, working as an underground organization. One member, Ayane Isuzu, is aready sick of society but she continues to defeat the Invaders only just to annoy her father. She learns that they revived Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl joins them and A.E.G.I.S. to stop Invaders while saving humanity once again.