Persona 3 is a popular Japanese role-playing game developed by Atlus, which has been adapted into an anime series. The story follows a group of high school students who investigate the mysterious 'Dark Hour,' a hidden time between one day and the next. Armed with the power of Persona, they battle Shadows and uncover the truth behind their school, Tartarus. The series is noted for its compelling narrative, unique blend of RPG and social simulation elements, and its exploration of themes like identity and mortality.