This is an Event Item exclusive to the PSP port of Riviera: The Promised Land. During the Fia and Lina bathing scene event, Ein will try to enter Undine Spring to sneak a peek. In the PSP version, a very unforgiving minigame was added to try and snatch this opportunity away from the player. If it is failed, Ein will slip over the Banango Peel and will hit his head, rendering him unconscious until the ladies are finished. After the event is over, enter Look Mode and examine the peel to collect it. It serves no apparent purpose.
Note: One must have obtained the Paradise Plume in order to trigger this event in the first place.