 If you liked
Devil Survivor 2 The Animation
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 ...then you might like
Juuou Mujin no Fafnir
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Both animes are about people teaming up to fight a limited number overwhelmingly powerful enemies that require a lot of planning, strategy, effort, and risk to take down.
Enemies tend to appear one at a time and each have their own "gimmick" that makes them sound almost impossible to kill, such as only being able to kill 3 enemies if you strike them all at the same time so they can't regenerate, or an enemy that's made of air and is impervious to most attacks.