Yuuna is a seven-year-old second-grade elementary school student who lives on Izayoi, a fictional island off the coast of Okinawa. While living on Izayoi, she has learned and studies karate, leading a fairly normal life despite having to deal with minor issues arising from living with her grandmother, Obaa. However, one day she encounters Stitch, a strange creature that has arrived from the depths of space.
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