Persona 4 is a main title in the Persona franchise. It features a new cast of characters set in a rural town, where serial murders are connected to an unusual TV program. It uses the same engine as Persona 3 with some improvements to battle: an updated UI, and the ability to directly control party members.
Many of the files from Persona 3 are compatible with Persona 4.
A PS Vita and PC version of Persona 4 exists called Persona 4 Golden with extra content and updated graphics.