If you liked
Gate: Jieitai Kanochi nite, Kaku Tatakaeri Part 2
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...then you might like
Nejimaki Seirei Senki: Tenkyou no Alderamin
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They both propose the same plot. Two lazy individuals who somehow get mixed up with military duties and becoming the "leader" of their squad. More than enough action in the both of them and the style of fighting typically endures warfare and tactics only the "leaders" can think of. Easily two of my favorite animes to date.
If you liked
Sword Art Online
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...then you might like
Hai to Gensou no Grimgar
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Portrays the ideals that individuals are placed in an hostile environment where they learn to openly express themselves as the warrior, magician, swordsman they are. Learning new abilities and coming closer in relationship with one another
If you liked
Sword Art Online
|
...then you might like
Log Horizon
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Based in a virtual reality setting, instead of dying in real life like SAO, once an individual dies they lose parts of their memories.
If you liked
Sword Art Online
|
...then you might like
Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka
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Dwelling in the deepest parts of the dungeons in order to achieve fame and power, Bell Cranel learns to maximize his powers and abilities while creating friendships. An adventure-like anime that shares ideals such as guilds, wizards, swords, and so forth.
If you liked
Koukyoushihen Eureka Seven
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...then you might like
Aquarion Evol
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They both portray robots/machines fighting while someone is usually controlling them in some way or another. Plus the plot is almost exactly the same; fighting for the one they love.