Follows a girl named Yuuna and her adventures with a mysterious space alien on an island off the coast of Japan. Stitch (original name: Experiment 626), an alien from outer space, one day ends up falling to an island located on Earth, called Izayoi Island, off the coast of Okinawa. He discovers "The Spiritual Stone" on Okinawa, with the help of his new friend Yuna, and learns it can grant his wish of becoming the strongest in the universe, provided he does 43 good deeds. Thus, with his Good Deed Counter made by Jumba, he is able to keep track of his good deeds, and keep track of his wish of becoming strongest in the universe. However, he has mischievous tendencies that often make him lose deeds due to his overabundance of such things.