"Persona Q: Shadow of the Labyrinth is a fusion of Etrian Odyssey and Persona, bringing the characters and mechanics from the Persona franchise into the dungeon-crawling adventure of Etrian Odyssey. It's mostly a good mix, but it's not consistent throughout the game.
Persona Q is set roughly around the mid-point of both Persona 3 and Persona 4. A space-time distortion brings the cast of both titles to a school that resembles Yasogami High. It's the middle of a cultural festival, and the school is dominated by a giant clock tower that isn't really there. The combined casts meet a pair of lost students named Rei and Zen, who are trying to find a way to leave the distorted Yasogami High. The only way out is to venture into labyrinths that have themes involving the various cultural festival events. The labyrinths are deadly and filled with Shadows. If the two groups of heroes can't find their way to the bottom, they'll never return home again."