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A yōkai named Warracchi starts playing harmless and amusing pranks on the island's inhabitants. Seeing how these pranks seem to make everyone happy, Stitch soon begins playing pranks of his own, but they quickly get out of hand.
Stitch is scolded by Yuna for making a mess. Rather than clear it up himself, he borrows a transmitter and calls in Felix to help. Felix cleans up messes all around the island's town, but he starts cleaning away antiques when he runs out of trash and messes to clean.
Yuna has a class visit to the local pineapple factory. She arrives late because Jumba invented a good deed tracker to let Yuna type her diaries. Stitch is more interested in eating the pineapples. Two yokai who look like pineapples then attack the pineapple factory, peeling the unprocessed pineapples and eating their flesh. Jumba invents a gun to stun and capture the yokai.