The battle for the treasure in Futaba’s palace is on! The final monster standing in the Phantom Thieves’ path is none other than the manifestation of Futaba’s guilt for her own mother’s death, and it fights tooth and claw to stop them from saving her. Things take a strange turn as Futaba appears in her own palace—something that shouldn’t even be possible! The truth behind her mother’s death is unraveled as the shackles guarding her memories loosen and the distortions weaken. But that truth only leads to even more mysteries...