If you're looking for anime similar to Persona Q: Shadow of the Labyrinth - Side:P3, you might like these titles.
Neku awakens in the middle of Shibuya’s bustling Scramble Crossingwith no memory of how he got there. Little does he know he’s been transported to an alternate planeof existence known as the Underground (UG). Now an unwilling participant in the mysterious “Reapers’ Game,” Neku must partner up with a girl named Shiki in order to survive. Together, they complete missions and defeat monsters known as “Noise”as they gradually uncover the true nature of this twisted Game.“ There’s only one way to stay alive in Shibuya: trust your partner.” Will they survive the Reapers’ Game?
One rainy night after a school festival, a group of students from Kisaragi Academy decide to perform the "Sachiko Ever After" charm, which will unite them forever as friends. Once the ritual is done, a sudden earthquake transports them to Heavenly Host, a torn down elementary school. Unbeknownst to Satoshi and his friends, however, is the horrific past behind it which culminated in its demolition. As they look for each other and try to escape from Heavenly Host, they soon find out their lives are at the mercy of those affected by that same bloodied past.
Hayato Mikogami is returning to working as a freelance journalist but has had little luck in the big city, so he decides to return to his hometown to investigate a series mysterious murders by a man wearing a skull mask. However, when he arrives, he finds that most people have little to say about the incidents since very few people witness the events first hand. In order to find more clues he reluctantly enlists Kiriko Mamiya as his photographer, and later that night, he comes across his first clue: a man, moments after he had been killed by the Skull Man...
Katrielle "Kat" Layton is the daughter of famed sleuth Professor Hershel Layton. Like her father, Kat also solves mysteries alongside her talking dog, Sheri.