A client comes to the CUREtto Detective Agency, asking them to help solve a mystery.

A calling card from the Phantom Thieves' Guild is sent to the Hosho Art Museum. Anna and Mikuru arrive on the scene, there Luluka strikes a conversation with Anna while in the Starlight Princess display room.

Anna and Mikuru head out to gather information about Cure Arcana Shadow. Meanwhile, Luluka disguises herself as a shop clerk and infiltrates a CD shop where the owner of the friendship bracelet containing the Makoto Jewel is located.