From the Megami Tensei Wiki
Persona X Detective is a spin-off of the video game Shin Megami Tensei: Persona 4 released on the PlayStation 2 in 2008. It stars one of the Major Characters of that game, Naoto Shirogane, as the main character, who at the time of this novel is a 16-17 year old police detective.
It takes place one year after the events of Persona 4 and features Naoto in a brand new town with a brand new school. While there she deals with the mystery of a bunch of recent disappearances.
This tag should only be used when the content of the picture displays elements specifically from the novel.