How found: On the first day, talk to Anju while wearing Kafei's Mask between 2 and 7 p.m. - she'll set up an 11:30 p.m. meeting. Return to the inn at night using either the Deku Flower outside or the room key and head to the kitchen. Anju will arrive at midnight; talk to her and she'll give you a letter. Drop it in one of the mailboxes and wait until the second day, then visit Kafei in his room by the laundry pool once the letter has been delivered. After talking to him, leave and wait until the afternoon of the final day. Return to Kafei's room and speak to the owner of the Curiosity Shop -- he'll give you Kafei's Keaton Mask.

    How used: Certain groups of plants will run away when you attack them - wear Keaton's Mask while doing so to get an appearance and a quiz from the famed ghost fox himself. Answer 5 of his questions right for a heart piece.