The story takes place at Tatsumi Port Island. A transfer student (Played by yours truly) just moved in to the Iwatodai Dorm. His parents had died several years ago in an accident.
He is quickly brought into a group called SEES (Special Extracurricular Execution Squad) when it seems that he is aware of the so called Dark hour.

During the Dark Hour, the outside world is totally altered, mostly with respect to atmosphere and color. The buildings, the night sky, as well as the moon would assume a sickly green color, while bodies of water turn crimson. Paddles looking like pools of blood will form in random surfaces as well, and all electrical appliances will cease to function. Normal humans will change into coffins and become oblivious to what is happening. Shadows become active during the Dark Hour and will attempt to lure humans out of their coffins in order to feed on their psyches, turning them into one of the Lost. If an ordinary human survives the Dark Hour without being attacked by a shadow, their memories will be wiped instead.

The people we'll be focusing on are people who have the potential to invoke a Persona, they are able to stay fully active during the Dark Hour and resist shadow attacks: even if they sleep, their bodies will not change into coffins, plus they will retain their memories.