Page 48 - Hidden Secrets

Translation

Left
SECRET GATHERING PLACE
But where do they hide? Find a special location where all the freed fairies gather.

It is said they have a "FINAL" TREASURE and will only give it up when a certain number of their friends are freed.

Right
Where do the fairies hide?

Elaboration

The 20 checkmark boxes become filled with X's as the player finds the associated fairy souls. Finding all of them, like suggested by the "100%" pen marking, satisfies page 54's 7th circle.