The stage is Ayanagi City, a city near the Japan Sea. It is a futuristic city that was built to carry out the recovery from the calamity caused by the "Apathy Syndrome" ten years previous. High school student Shin Kanzato with his little brother Jun, meet with their elder brother Ry&#333;, who is the chief of the Ayanagi City Police, again after ten years. At that time, a series of strange incidents happen in Ayanagi City such as the crew of a submarine that suddenly disappears while in their submarine, or a spiritless symptom which disturbs the world after ten years, or the case of the inside out corpse where a student took on a cruel appearance. Ry&#333; tracks down the organization behind the string of incidents, and having become involved in the incidents, Shin awakens the "Persona". 
(Source: Wikipedia)

Terrible creatures lurk in the dark, preying on those who wander into the hidden hour that lies between one day and the next—the Dark Hour. A secret school club known as SEES defends humanity from horrors and disasters while working to solve the mystery of the Dark Hour once and for all. 
A movie based on the 2006 RPG Persona 3, announced at the end of the Persona 4 movie, The Factor of Hope.

Persona 4 takes place in a rural town named Inaba. There have been mysterious murders occurring whenever there was fog after heavy rain. There were also rumors about a channel on television airing only at midnight called Mayonaka TV, during which it is said that one can see his/her "other half" when staring at the TV screen. 
After hearing about a recent unsolved murder which occurred during the fog, the characters—Narukami, Chie, and Yosuke—discuss how each of them had attempted to watch the mysterious TV channel and witnessed the murder victim. The protagonist later realizes that during midnight when the channel is on, his body can phase into his television set as a gateway to enter another world infested with shadows. 
After discovering this, they all decide to explore. When first completely entering the world, dazed and confused, Narukami meets Teddie. Mayonaka TV and the town murders seem to have a connection. The murder victims may be merely victims of Mayonaka TV. Everyone decides that they will together try to solve the mysterious murders by exploring the hidden world of Mayonaka TV.

Ren Amamiya is about to enter his second year after transferring to Shujin Academy in Tokyo. 
Following a particular incident, his Persona awakens, and together with his friends they form the “Phantom Thieves of Hearts” to reform hearts of corrupt adults by stealing the source of their distorted desires. 
Meanwhile, bizarre and inexplicable crimes have been popping up one after another… 
Living an ordinary high school life in Tokyo during the day, the group maneuvers the metropolitan city as Phantom Thieves after hours. 
Let the curtain rise for this grand, picaresque story!
 
(Source: Official website)

Novelization of the anime.
The novels are designed to be complementary to the series and focus on incorporating more of the Marebito's side of events into the main half of the story.

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