It's a spin off of the eternally popular JRPG series Shin Megamei Tensei: Persona which has 4 numbered entries (mostly on Playstation systems) plus a few spin offs (2 fighting games based on 4 and 3, a forthcoming rhythm game based on 4, an extended version of 3, an enhanced version of 3 with the option of playing as a female, a very enhanced and expanded version of 4... oh and there were 2 versions of 2....)
Persona Q takes the casts of 3 and 4, makes them Chibi and puts them into a dungeon crawler similar to the Etrian Odyssey games. Rumour has it that it retains the excellent storytelling and characterisation of the main games so it should be worth investigating for that alone. Not sure if a newcomer to the series will be able to jump right in or if you need some foreknowledge of events...