Anna and Mikuru are on their way to school when Rei, the Student Council President...

In the letter that arrived from London, Anna and the others learn that Cure Arcana Shadow is a genius detective named Luluka Moria. They go to a lake in search of more clues, where they encounter Luluka herself.

Novelist Eliza comes to the CUREtto Detective Agency to ask to work as a detective to get ideas for her next novel. Not long after that, the girls get a request to search for a missing cat.