When you begin the game and pass the part with Alfonso's ship, return to your island. Get out of the underground base of Pirate Isle. Aika will say that she needs to freshen up a bit. Go to her house, then face towards the door. Go all the way to the left left until you see a clothesline. In that one corner you will see, pasted on the wall of that house corner, a handkerchief. Inspect the handkerchief and you will see a hidden FMV sequence of how Aika looks with her hair down.