Mermaid Melody Pichi Pichi Pitch Pure EP22 - Robber of Memories

Coco, Noel, and Caren leave. Lucia then gets a strange box from Rihito. Later, Lucia, Hanon, and Rina believe that there is a robber at Pearl Piari when there is a mess in the kitchen, so they decide to set up traps, unintentionally catching Nagisa and finding out the thief was a cat. The box gets stolen, however, and Lucia looks all over town for it. In the end, it turns out that Rihito himself stole the box.