Why Naru hates themeparks

The SPR gang takes a case at a theme park that I made up. The park is haunted by a little girl with a temper issue and Mai and Naru get trapped in a haunted house, there's also something up with the house of mirrors. Two ghosts? Anyway, takes place before the gang finds out about Naru being who he is and all, but they will find out...Mai/Naru, Lin/Madoka, John/Masako kinda creepy