第 17 集: 在怪盜團返回殿堂之前，眾人說服雙葉敞開心扉
2018年7月29日 播出
Ren and the group convince Futaba to open the door to her room out of her own free will. Then, as the Phantom Thieves sneak back into the Palace to steal Futaba's Treasure, she follows them in. Inside, Futaba encounters a giant monster in her mother's form with a deep grudge against Futaba. (Source: Aniplex USA)