Shikyouin Hibiki no Karei naru Oasobi

PriPara is a place where anyone can be an idol. However, a major update went haywire and now PriPara is in danger of disappearing! In the fashion capital of PriParis, the former Prisiennes who used to be charming and sparkly idols have lost their memories and now go about their day-to-day lives feeling as though they're missing something. Things suddenly change when one of these Prisiennes receives an invitation card. On a sleepless night, the rich scent of casablanca fills the air and Phantom Thief Genius Neo appears. "Bienvenue! Let us fall together into nighttime Idol Land PriPara!" Hibiki Shikyouin's brilliant play begins in secret while a detective named Chris searches for the truth behind Phantom Thief Genius Neo! (Source: Shufu to Seikatsu Sha, translated)