Rundown

(Follows P5R timeline)
CONTAINS SPOILERS

The cases of capturing The Phantom Thieves are harder on the police everyday with no trace of finding them, stealing hearts and having a change of heart. It could be a work a supernatural or demons.

There's only one choice to make, exorcist from True Cross Academy could help help them find these so call Phantom Thieves of hearts.

P5R: After the 4th palace
BE: After the Imperial King Arc