Using this set is easy! First, pick the heart - shaped case with the accessory you like. You can wear the accessories right away to transform into your favorite You and Idol Precure character. To use them with the Idol Heart Brooch, simply attach the compatible accessories to the brooch. When you're done using the set, store the heart cases in a cool and dry place to keep the accessories in good condition. Avoid exposing them to direct sunlight for a long time as it might fade the colors. If the accessories get dirty, gently wipe them with a soft, dry cloth.