What was supposed to be a relaxing day of shopping with Reiya turns hectic when Loki realizes that his companion can transform into Freya without the Brising necklace. Back at home, curious things begin to happen after Yamino finds an odd flower in the hallway.
Mayura needs to get a passing grade in her class, or she will have to stay after school, which means no more time for solving mysteries. As she and Narugami hit the books, a wishing tree begins to grow from a gem dropped by Frey.
A mysterious young girl named Reiya shows up on Loki's doorstep asking for help. She claims that, at night, furniture has been moving on its own and she has been hearing footsteps. However, Reiya's head butler refutes her story.
Loki uses his powers to make Mayura and her father, who disapproves of her detective adventures, recall what their lives were like 10 years ago in hopes that these memories will bring the feuding loved ones closer together.