With nowhere to go, Luluka spends her days at Pâtisserie ChuChu. While she's there, a customer's lost item containing a Makoto Jewel is stolen. Anna and the others deduce that the culprit must be among three customers on the terrace and prepare to question them, but Luluka intervenes.

Just as Luluka is settling into the CUREtto Detective Agency, Goemon barges in. Unable to accept her departure from the Phantom Thieves' Guild, he generates a trick maze to test her skills. Countless doors appear, all leading to other worlds, and who appears from behind those doors...?

Anna and the others recover a wooden box that was stolen by the Phantom Thieves' Guild and take it to the police for help with finding the owner. Shiruku Ieiri is there as Police Chief for a day, and helps put out a call for the owner, but three people arrive, all claiming to own the item.