Cinderella is a fairy tale adapted from a Greek folk tale. The most famous version, by French writer Charles Perrault, introduced the iconic "glass" slippers, as well as the pumpkin carriage and the fairy-godmother.
"Beautiful shoes only possible through many sacrifices."
—Item description, Persona Q2: New Cinema Labyrinth
The Steel Slippers are a weapon for Chie. It can be purchased from the Shop for ¥23,500 after selling one Maya Gem and two Maya Honeys, dropped by Devious Maya in Hikari.