History Anime / GateKeepers21

31 years have passed since the Far Eastern Branch of AEGIS and the Invaders waged war in Japan. The heyday of growth and prosperity has passed, the crime rate has increased, environmental problems have worsened, and the international situation has become increasingly unstable. Coupled with the decline in the morals of the Japanese people comes the emergence of a new type of Invader -- one that can absorb ordinary humans into its ranks.

* LamarckWasRight: [[spoiler:Ayane inherited her power from her father Shun, who in turn inherited it from his father].]]

%%* ActionGirl: Satoka, with an ''arsenal'' of swords.

* BadassBookworm: Ayane Isuzu is quiet, ranked third in the second year level of her high school, spends most of her time reading and sitting in front of her laptop. She is also the leading cause of Invader death by blunt cell phone trauma.
%% This doesn't explain what the reaction is * BerserkButton: Ayane ''really'' likes birds. God help you if you do anything bad to them. Just ask [[spoiler:Count Akuma]].
%%* BlastOut: Yukino and Ghost Girl move from a MexicanStandoff to this in the final episode.

%%* {{BFS}}: Satoka's Gate Power calls forth these.

%%* BuddyCopShow: Ayane and Miu (StudentAndMasterTeam variation).

%%* CoolShades: Kageyama
* DarkerAndEdgier: Compared to the prequel, things look a lot more grim. Many of the previous cast is dead, some of them killed while fighting the Invaders, and the Invaders show no signs of letting up. It's also revealed that using the Gate powers carries a hefty toll on the body, as shown by the remaining Gate Keepers from the prequel.

%%* DemonicInvaders: The Invaders, natch.

* DisappearedDad: Shun doesn't make an appearance in this anime, [[spoiler:and the interquel novel reveals that he's died fighting the Invaders.]]
%%* TheDitz: Miyu.

%%* TheEndOfTheWorldAsWeKnowIt: [[BigBad Ghost Girl]] causes this in the GrandFinale.

%%* {{Hammerspace}}: Where Satoka keeps all her PureEnergy {{Cool Sword}}s.

%%* OneWomanWail: The opening theme.

%%* PlantAliens: Count Akuma has now become this

%%* ScaryShinyGlasses: Ayane Isuzu.

%%* TheStoic: Ayane

%%* ThoseTwoGuys: Miyu's friends, Chinami and Nao-chan.

%%* TheVirus: The Invaders.
%%* VaporWear: Ghost Girl.

%%* TheAtoner: Kageyama

%%* DarkerAndEdgier: In ''Gate Keepers'', you had hope the ThePowerOfLove would prevail. Here, not so much.

* HopelessWar: In contrast to the ending of Anime/GateKeepers, the invasion is proceeding nicely (over half of humanity has been subverted at that point), there's no way to actually win, and the very power used to fight the invaders will [[EquivalentExchange kill the users. Or worse.]] Ouch. [[spoiler:The ending, however, has the tables turn in humanity's favor, with most of the Invaders wiped out. Granted it required a ResetButton, and that the remaining ones are still in the open, but still...]]

* InconsistentDub: The English dub of the TV series refers to Akuma Hakushaku as "Baron Akuma." In this one, he is called "Count Akuma" instead.

%%* ResetButton: [[spoiler:The GrandFinale]]

%%* BlowYouAway: Ayane's Gate power

%%* DisappearedDad: Shun.

%%* ParentalAbandonment

%%* ReallySevenHundredYearsOld: Yukino and Yurei Shoujo.

%% This doesn't explain what the reaction is * Berserk Button: Ayane ''really'' likes birds. God help you if you do anything bad to them. Just ask [[spoiler:Count Akuma]].

* BerserkButton: Ayane ''really'' likes birds. God help you if you do anything bad to them. Just ask [[spoiler:Count Akuma]].

* ContinuityNod: When Ayane and Miyu launch the [[CoolCar UP-15]] from the [[SelfDestructMechanism self-destructing]] AEGIS base, Yukino does the "Ooh, intense!" thing that accompanied AEGIS vehicle launches in the original series. No {{Panty Shot}}s, though.

%%* {{Meganekko}}: Ayane