Calm Pesce shadows are only found on the first floor of Yukiko's Castle. Upon being defeated, they may drop Idea Paper. Selling 10 of these to Daidara will unlock the Plum Potpourri accessory for sale.
Calm Pesce appears on the first and third floors of Yukiko's Castle. The Idea Paper material it drops will instead unlock the Vigor Fob accessory after selling one piece at Daidara Metalworks.
Persona Q: Shadow of the LabyrinthEdit