 If you liked
Persona 4 the Animation
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 ...then you might like
Fate/stay night: Unlimited Blade Works
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Similar artstyle and similar start : Mysterious murders happened in the city MCs living at, and as it's revealed the incidents are related with supernatural events the MCs just discovered. The main characters in both anime are teenagers whose powers to summon a supernatural creatures to fight.
Both anime are also adapted from an interactive game/VN with action RPG.
However, Fate/ Stay Night : UBW is more serious and action-focused, while Persona 4, despite also has actions, more excels in its mysteries, comedies and the fun aspects of its characters' interactions.